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Facing java.lang.NullPointerException in spring boot application

I am trying to make Log In page using spring boot. I have three categories of user : Student, College , Company. When I check if user exist or not following code is working fine for Student but not working for other two. It gives NullPointerException with message Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException: Cannot invoke "com.springboot.controller.repository.CollegeRepo.findByEmail(String)" because "this.clgrepo" is null] with root cause
I am having three different tables for three categories in database. Please let me know if I am doing something wrong.
Following is my code:
Main Class
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
#EntityScan(basePackages="com.springboot.controller.model")
#EnableJpaRepositories(basePackages="com.springboot.controller.repository")
#SpringBootApplication
public class CunsultustodayWebServicesApplication {
public static void main(String[] args) {
SpringApplication.run(CunsultustodayWebServicesApplication.class, args);
}
}
LoginController.java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;
import com.springboot.controller.model.CollegeReg;
import com.springboot.controller.model.CompanyReg;
import com.springboot.controller.model.User;
import com.springboot.controller.repository.CollegeRepo;
import com.springboot.controller.repository.CompanyRepo;
import com.springboot.controller.repository.UserRepo;
import com.springboot.controller.services.StudentService;
#RestController
public class LoginController {
#Autowired(required=true)
private StudentRepo stdrepo;
private CollegeRepo clgrepo;
private CompanyRepo cmprepo;
#RequestMapping("/")
public ModelAndView checkMVC()
{
ModelAndView mav= new ModelAndView("Login");
return mav;
}
#RequestMapping("/login")
public ModelAndView loginHome(#RequestParam(value="email" ,required=true) String email, #RequestParam(value="password", required=true) String password, Model model)
{
StudentReg u= null;
u= stdrepo.findByEmail(email);
if(u!=null) {
model.addAttribute("email", email);
ModelAndView mav=new ModelAndView("HomePage");
return mav;
}
else {
CollegeReg c=null;
c=clgrepo.findByEmail(email);
if(c!=null) {
model.addAttribute("email", email);
ModelAndView mav=new ModelAndView("HomePage");
return mav;
}
else {
CompanyReg co=null;
co=cmprepo.findByEmail(email);
if(co!=null) {
model.addAttribute("email", email);
ModelAndView mav=new ModelAndView("HomePage");
return mav;
}
}
}
//model.addAttribute("error", "User not found");
ModelAndView mav=new ModelAndView("Login");
return mav;
}}
StudentRepo.java
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Service;
import com.springboot.controller.model.StudentReg;
#Service("StudentRepo")
public interface StudentRepo extends JpaRepository<StudentReg,Integer> {
StudentReg findByEmail(String email);
}
CollegeRepo.java
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Service;
import com.springboot.controller.model.CollegeReg;
#Service("CollegeRepo")
public interface CollegeRepo extends JpaRepository<CollegeReg,Integer>{
CollegeReg findByEmail(String email);
}
CompanyRepo.java
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Service;
import com.springboot.controller.model.CompanyReg;
#Service("CompanyRepo")
public interface CompanyRepo extends JpaRepository<CompanyReg,Integer> {
CompanyReg findByEmail(String email);
}
StudentReg.java
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Table;
import javax.persistence.Id;
#Entity
#Table(name="tbl_student_reg")
public class User {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column(name="std_id")
private int stdId;
#Column(name="email")
private String email;
#Column(name="password")
private String password;
public User() {}
public int getStdId() {
return stdId;
}
public void setStdId(int stdId) {
this.stdId = stdId;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
CollegeReg.java
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="tbl_colleges_reg")
public class CollegeReg {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column(name="clg_id")
private int clgId;
#Column(name="email")
private String email;
#Column(name="password")
private String password;
public CollegeReg() {
super();
}
public int getClgId() {
return clgId;
}
public void setClgId(int clgId) {
this.clgId = clgId;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
CompanyReg.java
package com.springboot.controller.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="tbl_companies_reg")
public class CompanyReg {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column(name="comp_id")
private int compId;
#Column(name="name")
private String name;
#Column(name="email")
private String email;
#Column(name="password")
private String password;
public CompanyReg() {
super();
}
public int getCompId() {
return compId;
}
public void setCompId(int compId) {
this.compId = compId;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
ErrorLog
java.lang.NullPointerException: Cannot invoke "com.springboot.controller.repository.CollegeRepo.findByEmail(String)" because "this.clgrepo" is null
at com.springboot.controller.resource.LoginController.loginHome(LoginController.java:52) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.4.jar:5.3.4]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.4.jar:5.3.4]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.4.jar:5.3.4]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.4.jar:5.3.4]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.4.jar:5.3.4]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.4.jar:5.3.4]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) ~[spring-webmvc-5.3.4.jar:5.3.4]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.4.jar:5.3.4]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.4.jar:5.3.4]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.4.jar:5.3.4]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.43.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.4.jar:5.3.4]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.43.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.43.jar:9.0.43]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.4.jar:5.3.4]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.4.jar:5.3.4]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.4.jar:5.3.4]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
Please Help
Thanks!

Please, check your LoginController class.
You have #Autowired only on StudentRepo, but the rest 2 repoes don't have such annotation. They won't be autowired and will set as null by default.
Place #Aitowired annotation there also and check again.

The repository is not injected.
In LoginController either create a constructor with your repositories (preferable way) or mark fields as #Autowired.

SpringBoot JPA Derby - Null Pointer Exception while making CRUD requests

I made a simple CRUD application using Springboot, JPA and derby stack. I have implemented create and read functions but they result in NullPointer Exception.
The application is able to connect to the database as I can see the data written by EmployeeInit.java in ij console.
After searching on google and SO, I figured similar error occurred because of some missing annotations but I am not to figure out what is missing in mine.
Here are the details:
Error - Get Request
java.lang.NullPointerException: null
at com.springboot.controller.EmpController.getEmployee(EmpController.java:52) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.3.jar:5.3.3]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.3.jar:5.3.3]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.3.jar:5.3.3]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.3.jar:5.3.3]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.3.jar:5.3.3]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.3.jar:5.3.3]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) ~[spring-webmvc-5.3.3.jar:5.3.3]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.3.jar:5.3.3]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.3.jar:5.3.3]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.3.jar:5.3.3]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) ~[tomcat-embed-core-9.0.41.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.3.jar:5.3.3]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.41.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.41.jar:9.0.41]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.3.jar:5.3.3]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.3.jar:5.3.3]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.3.jar:5.3.3]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.3.jar:5.3.3]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.3.jar:5.3.3]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.3.jar:5.3.3]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.41.jar:9.0.41]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Employee.java
package com.springboot.entities;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
#Entity
public class Employee {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long empId;
#Column(length=30, name="EMP_NAME")
private String name;
private float salary;
public Employee() {
}
public Employee(String name, float salary) {
super();
this.name = name;
this.salary = salary;
}
public Employee(Long empId, String name, float salary) {
super();
this.empId = empId;
this.name = name;
this.salary = salary;
}
public Long getEmpId() {
return empId;
}
public void setEmpId(Long empId) {
this.empId = empId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getSalary() {
return salary;
}
public void setSalary(float salary) {
this.salary = salary;
}
}
EmpController.java
package com.springboot.controller;
import java.util.Optional;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.springboot.entities.EmpRepository;
import com.springboot.entities.Employee;
#RestController
#RequestMapping("employees")
public class EmpController {
private EmpRepository repo;
public EmpController() {
}
#PostMapping
public String saveEmployees(Employee e) {
System.out.print(e);
if (repo.existsById(e.getEmpId())) {
return "Employee exists!";
}
else {
repo.save(e);
return "Data saved!";
}
}
#GetMapping(value = "{eid}")
public ResponseEntity<?> getEmployee(#PathVariable("eid") Long empId) {
System.out.print(empId);
Optional<Employee> opt = repo.findById(empId);
if(opt.isPresent()) {
return new ResponseEntity<Employee>(opt.get(), HttpStatus.OK);
}
return new ResponseEntity<String>("Data not found!", HttpStatus.NOT_FOUND);
}
}
EmpRepository.java
package com.springboot.entities;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
#Repository
public interface EmpRepository extends CrudRepository<Employee, Long> {
}
EmployeeInit.java
package com.springboot;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Service;
import com.springboot.entities.EmpRepository;
import com.springboot.entities.Employee;
#Service
public class EmployeeInit implements CommandLineRunner {
#Autowired
EmpRepository repo;
public EmployeeInit() {
}
#Override
public void run(String... args) throws Exception {
repo.save(new Employee("Ashwani", 10000));
repo.save(new Employee("Rahul", 13000));
repo.save(new Employee("Ram", 20000));
repo.save(new Employee("Trex", 15000));
}
}
Main file - Springboot5DerbyApplication.java
package com.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class Springboot5DerbyApplication {
public static void main(String[] args) {
SpringApplication.run(Springboot5DerbyApplication.class, args);
}
}
application.properties
spring.datasource.url=jdbc:derby:D:/DevSpace/JavaWorkspace/derbydb14
spring.datasource.driver-class-name=org.apache.derby.jdbc.EmbeddedDriver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.DerbyTenSevenDialect
spring.jpa.hibernate.ddl-auto=update
spring.datasource.username=SA
Thanks a lot in advance!

I think there is a bean issue, you missed autowire for repository.
Try #Autowired
private EmpRepository repo; in controller.
Creating a constructor is not required in controller.

issue while trying to build an api with springboot [closed]

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I am trying to develop a restful web service with spring boot but am getting errors and i have tried different things but don't know what the problem is nor how to fix it. The error message is pointing to my rest Controller class but i don't see why. Here is the error trace from my browser:
There was an unexpected error (type=Internal Server Error, status=500).
No message available
java.lang.NullPointerException
at com.dafe.spring.applogger.rest.UserLogRestController.findAll(UserLogRestController.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:893)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:798)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:94)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
here's the RestController class that is been pointed to by the error trace. I would appreciate some insights.
package com.dafe.spring.applogger.rest;
import java.util.List;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.dafe.spring.applogger.dao.UserLogDAO;
import com.dafe.spring.applogger.entity.UserLog;
#RestController
#RequestMapping("/api")
public class UserLogRestController {
private UserLogDAO userLogDao;
//inject logDao using constructor injection
public UserLogRestController(UserLogDAO theUserLogDao) {
}
//expose logs and return list of logs
#GetMapping("/logs")
public List<UserLog> findAll(){
return userLogDao.findAll();
}
}
Here is my Dao implementation class:
package com.dafe.spring.applogger.dao;
import java.util.List;
import javax.persistence.EntityManager;
import org.hibernate.Session;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import com.dafe.spring.applogger.entity.UserLog;
#Repository
public class UserLogDaoHibernateImplementation implements UserLogDAO {
//define field for entity manager
private EntityManager entityManager;
//set up constructor injection
#Autowired
public UserLogDaoHibernateImplementation(EntityManager theEntityManager) {
entityManager= theEntityManager;
}
#Override
#Transactional
public List<UserLog> findAll() {
//get the current hibernate session from entity manager
Session currentSession = entityManager.unwrap(Session.class);
//create a query
Query <UserLog> theQuery =
currentSession.createQuery("from log", UserLog.class);
//execute query and get result list
List<UserLog> userLog = theQuery.getResultList();
//return the results
return userLog;
}
}
here is my entity class
package com.dafe.spring.applogger.entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="log")
public class UserLog {
//define field
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Column(name="id")
private int id;
#Column(name="user_id")
private String userId;
#Column(name="session_id")
private String sessionId;
//define constructors
public UserLog() {
}
public UserLog(String userId, String sessionId) {
this.userId = userId;
this.sessionId = sessionId;
}
//define getters and setters
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getSessionId() {
return sessionId;
}
public void setSessionId(String sessionId) {
this.sessionId = sessionId;
}
#Override
public String toString() {
return "Log [id=" + id + ", userId=" + userId + ", sessionId=" + sessionId + "]";
}
//define toString
}
I would be grateful if you help me spot the problem or proffer a way out. Thank you.

I just got it, thanks for your contributions. After using the autowire annotation just above the private userLogDao and it did not work even though that was a valid suggestion, I spotted another error in my code which was that i used the wrong relative path on my GetMapping. Instead of "/userLog" I used "/log". Am so excited. Thanks all!

(Easy fix!;) You forgot to:
#Autowired //!! or similar
on your:
private UserLogDAO userLogDao;
..or respectivley/alternatively:
public UserLogRestController(/*#Autowired implicitely*/ UserLogDAO theUserLogDao) {
userLogDao = theUserLogDao;
}
..in your constructor.

fasterxml.jackson.databind Invalid Definition Exception

I am trying to do a post request using a URL which I've defined as the endpoint.
Controller Code:
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.abc.datacollection.Constants;
import com.abc.datacollection.dao.UserClickDataRepository;
import com.abc.datacollection.entity.UserClickData;
import com.abc.datacollection.entity.UserClickProjection;
import com.abc.datacollection.entity.UserClickProjection2;
#Controller
#RequestMapping(path="/user_click_data")
public class UserClickDataController {
#Autowired
private UserClickDataRepository userClickDataRepository;
/**
* this method adds user click data records into user_click_data table
* #param searchHisObj
* #return
*/
#CrossOrigin(origins = "*")
#PostMapping(path="/add", consumes = "application/json", produces = "application/json") // Map ONLY POST Requests
public #ResponseBody String addUserClickDataRecord (#RequestBody List<UserClickData> searchHisObj) {
userClickDataRepository.saveAll(searchHisObj);
System.out.println("saved click data:"+searchHisObj);
return Constants.STATUS_OK;
}
/**
* this method fetches all user click data records from user_click_data table
* #return
*/
#CrossOrigin(origins = "*")
#GetMapping(path="/all")
public #ResponseBody List<UserClickProjection> getAllUserClickDataRecords() {
return userClickDataRepository.findAllProjectedBy();
}
#CrossOrigin(origins = "*")
#GetMapping(path="/allsecond")
public #ResponseBody List<UserClickProjection2> getAllUserClickDataRecords2() {
return userClickDataRepository.findAllProjectedBy2();
}
}
DAO Code:
import java.util.List;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.abc.datacollection.entity.UserClickData;
import com.abc.datacollection.entity.UserClickProjection;
import com.abc.datacollection.entity.UserClickProjection2;
import com.abc.datacollection.entity.UserProjection;
#JsonDeserialize(as = com.abc.datacollection.entity.UserClickData.class)
public interface UserClickDataRepository extends CrudRepository<UserClickData, Integer> {
public static final String FIND_QUERY =
"select new com.abc.datacollection.entity.UserClickData(user.u_type, COUNT(user.u_type)) from UserClickData user GROUP BY user.u_type ORDER BY COUNT(user.u_type) DESC";
#Query(value = FIND_QUERY)
//public List<UserProjection> getAllRequestResponseRecords();
List<UserClickProjection> findAllProjectedBy();
public static final String FIND_QUERY_2 =
"select new com.abc.datacollection.entity.UserClickData(user.u_type, COUNT(user.u_type), user.sys_updated_on) from UserClickData user GROUP BY user.sys_updated_on ORDER BY sys_updated_on DESC";
#Query(value = FIND_QUERY_2)
//public List<UserProjection> getAllRequestResponseRecords();
List<UserClickProjection2> findAllProjectedBy2();
}
Class:
import java.util.Date;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Transient;
#Entity // This tells Hibernate to make a table out of this class
public class UserClickData {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int sys_id;
private String u_search_term;
private String u_index;
private String u_sysid;
private String u_table;
private String u_facet_id;
private String department;
private Date sys_updated_on;
private String u_type;
private int flag;
private String u_user;
private String u_solr_request_response;
private String u_title;
private String u_page;
private String u_portal;
#Transient
private long count;
// public UserClickData(int sys_id, String u_search_term, String u_index, String u_sysid, String u_table, String u_facet_id, String department, Date sys_updated_on, String u_type, int flag, String u_user, String u_solr_request_response, String u_title, String u_page, String u_portal) {
// this.sys_id = sys_id;
// this.u_search_term = u_search_term;
// this.u_index = u_index;
// this.u_sysid = u_sysid;
// this.u_table = u_table;
// this.u_facet_id = u_facet_id;
// this.department = department;
// this.sys_updated_on = sys_updated_on;
// this.u_type = u_type;
// this.flag = flag;
// this.u_user = u_user;
// this.u_solr_request_response = u_solr_request_response;
// this.u_title = u_title;
// this.u_page = u_page;
// this.u_portal = u_portal;
// }
public UserClickData(String u_type, long count) { //, long count
this.u_type = u_type;
this.count=count;
}
public UserClickData(String u_type, long count, Date sys_updated_on ) {
this.u_type = u_type;
this.count=count;
this.sys_updated_on=sys_updated_on;
}
public long getCount() {
return count;
}
public void setCount(long count) {
this.count=count;
}
public int getSys_id() {
return sys_id;
}
public void setSys_id(int sys_id) {
this.sys_id = sys_id;
}
public String getU_search_term() {
return u_search_term;
}
public void setU_search_term(String u_search_term) {
this.u_search_term = u_search_term;
}
public String getU_index() {
return u_index;
}
public void setU_index(String u_index) {
this.u_index = u_index;
}
public String getU_sysid() {
return u_sysid;
}
public void setU_sysid(String u_sysid) {
this.u_sysid = u_sysid;
}
public String getU_table() {
return u_table;
}
public void setU_table(String u_table) {
this.u_table = u_table;
}
public String getU_facet_id() {
return u_facet_id;
}
public void setU_facet_id(String u_facet_id) {
this.u_facet_id = u_facet_id;
}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
public Date getSys_updated_on() {
return sys_updated_on;
}
public void setSys_updated_on(Date sys_updated_on) {
this.sys_updated_on = sys_updated_on;
}
public String getU_type() {
return u_type;
}
public void setU_type(String u_type) {
this.u_type = u_type;
}
public int getFlag() {
return flag;
}
public void setFlag(int flag) {
this.flag = flag;
}
public String getU_user() {
return u_user;
}
public void setU_user(String u_user) {
this.u_user = u_user;
}
public String getU_solr_request_response() {
return u_solr_request_response;
}
public void setU_solr_request_response(String u_solr_request_response) {
this.u_solr_request_response = u_solr_request_response;
}
public String getU_title() {
return u_title;
}
public void setU_title(String u_title) {
this.u_title = u_title;
}
public String getU_page() {
return u_page;
}
public void setU_page(String u_page) {
this.u_page = u_page;
}
public String getU_portal() {
return u_portal;
}
public void setU_portal(String u_portal) {
this.u_portal = u_portal;
}
}
Error Stack:
2019-10-16 16:02:29.394 ERROR 9058 --- [nio-9000-exec-6] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class com.servicenow.datacollection.entity.UserClickData]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.servicenow.datacollection.entity.UserClickData` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
at [Source: (PushbackInputStream); line: 1, column: 3] (through reference chain: java.util.ArrayList[0])] with root cause
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.abc.datacollection.entity.UserClickData` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
at [Source: (PushbackInputStream); line: 1, column: 3] (through reference chain: java.util.ArrayList[0])
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1452) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1028) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1297) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:326) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:286) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:245) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:27) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3084) ~[jackson-databind-2.9.9.jar!/:2.9.9]
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:239) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:227) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:204) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:157) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:130) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:126) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:88) ~[spring-boot-actuator-2.1.6.RELEASE.jar!/:2.1.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:114) ~[spring-boot-actuator-2.1.6.RELEASE.jar!/:2.1.6.RELEASE]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:104) ~[spring-boot-actuator-2.1.6.RELEASE.jar!/:2.1.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar!/:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.21.jar!/:9.0.21]
at java.base/java.lang.Thread.run(Thread.java:835) ~[na:na]
URL I'm trying to access: http://127.0.0.1:9000/user_click_data/add
Payload I'm trying to post:
[
{
"u_search_term":"madrid",
"u_index":1,
"u_sysid":"0db06114db4cc8904819fb2439961991",
"u_table":"",
"u_facet_id":"",
"department":"",
"sys_updated_on":"2019-10-16T10:32:29.108Z",
"u_type":"METROCOMM",
"flag":0,
"u_user":"",
"u_solr_request_response":"\"madrid\" OR madrid",
"u_title":"",
"u_page":"",
"u_portal":""
}
]
As you can see, I've added #JsonDeserialize annotation which I imported from com.fasterxml.jackson.databind.annotation.JsonDeserialize.
Can someone tell me what I'm doing wrong here. Thanks.

Declare a default constructor inside your class.

Can't update a field in a PostgreSQL table

I'm trying to build a question answer website like Stack Overflow, to learn how RESTful web services work, it is my first time writing web services, I have already made the controller for asking the questions and answering them.
But there's a problem, which I had when I was making a REST Endpoint for the upvote, so whenever a user upvotes a question, I have to update the number of votes a question has in the questions table (at the start it is zero) but when I'm trying to hit the Endpoint for Upvote the update query which I have written throws an error and shows me the error page.
The error thrown:
org.postgresql.util.PSQLException: No results were returned by the query.
at org.postgresql.jdbc.PgPreparedStatement.executeQuery(PgPreparedStatement.java:107) ~[postgresql-42.2.5.jar:42.2.5]
at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52) ~[HikariCP-3.2.0.jar:na]
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java) ~[HikariCP-3.2.0.jar:na]
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:60) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.getResultSet(Loader.java:2167) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1930) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1892) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.doQuery(Loader.java:937) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:340) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.doList(Loader.java:2689) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.doList(Loader.java:2672) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2506) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.Loader.list(Loader.java:2501) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:338) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:2223) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.internal.AbstractSharedSessionContract.list(AbstractSharedSessionContract.java:1069) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.query.internal.NativeQueryImpl.doList(NativeQueryImpl.java:170) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1505) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.hibernate.query.internal.AbstractProducedQuery.getSingleResult(AbstractProducedQuery.java:1553) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:221) ~[spring-data-jpa-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:91) ~[spring-data-jpa-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:136) ~[spring-data-jpa-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:125) ~[spring-data-jpa-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:605) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$invoke$3(RepositoryFactorySupport.java:595) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:595) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:138) ~[spring-data-jpa-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61) ~[spring-data-commons-2.1.9.RELEASE.jar:2.1.9.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at com.sun.proxy.$Proxy100.vote(Unknown Source) ~[na:na]
at com.demo.beans.controller.QuestionController.upvoteQuestion(QuestionController.java:222) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_91]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_91]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:151) ~[spring-session-core-2.1.7.RELEASE.jar:2.1.7.RELEASE]
at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:85) ~[spring-session-core-2.1.7.RELEASE.jar:2.1.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.21.jar:9.0.21]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_91]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.21.jar:9.0.21]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]
Code for the QuestionRepository which is used to update the votes:
package com.demo.beans.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import com.demo.beans.Question;
#Repository
public interface QuestionRepository extends JpaRepository<Question, Long> {
#Query(value = "SELECT * from questions where pr_key=:pr_key", nativeQuery = true)
public Question findByPrKey(#Param("pr_key") String prKey);
#Query(value = "UPDATE questions SET questionvotes=:questionvotes where pr_key=:pr_key", nativeQuery=true)
public void changeVotes(#Param("questionvotes") int questionVotes, #Param("pr_key") String prKey);
}
Here the second query is responsible for updating the votes.
I'm calling this function in the QuestionsController in this method:
#RequestMapping("/upvoteQuestion")
public String upvoteQuestion(#CookieValue(value = "username", defaultValue = "null") String username,
#CookieValue(value = "password", defaultValue = "null") String password, #Valid QuestionVote questionVote) {
System.out.println("works" + questionVote.getQuestionPrKey() + " " + questionVote.getUserPrKey());
if (!username.equals("null") && !password.equals("null")) {
// checks whether there is user with the username and password given
// by the cookie
if (userRepository.checkWhetherAccountExists(username, password).get(0) != null) {
questionVote.setUserPrKey(userRepository.findUsingUsername(username).getPrKey());
if (questionVoteRepository.checkUpvote(questionVote.getQuestionPrKey(), questionVote.getUserPrKey()).equals("false")) {
questionVoteRepository.vote("true", "false", questionVote.getQuestionPrKey(),questionVote.getUserPrKey());
System.out.println("Question PrKey: " + questionVote.getQuestionPrKey());
questionRepository.changeVotes(13, questionVote.getQuestionPrKey());
}
}
}
return "redirect:/questions/"+questionVote.getQuestionPrKey();
}
In the above code, the following line throws the error:
questionRepository.changeVotes(13, questionVote.getQuestionPrKey());
My Question class looks like this:
package com.demo.beans;
import java.sql.Time;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;
#Entity
#Table(name = "questions")
public class Question {
#Id
#GeneratedValue(generator = "uuid")
#GenericGenerator(name = "uuid", strategy = "uuid2")
#Column(name = "PR_KEY")
private String prKey;
#Column(name = "postedby")
private String postedBy; // pr_key of the person who posted the question
#Column(name = "postedbyusername")
private String postedByUsername; // username of the person who posted the
// question
#Column(name = "title", columnDefinition = "varchar(1000)")
private String title; // title of the question
#Column(name = "content", columnDefinition = "varchar(10000)")
private String content; // content of the question
#Column(name = "code", columnDefinition = "varchar(10000)")
private String code; // code (if included) of the question
#Column(name = "viewscount")
private int views_count; // views count of the question
#Column(name = "answercount")
private int answer_count; // answers count of the question
#Column(name = "tag")
private String tag; // tag which a question is tagged
#Column(name = "questionaskedtime")
private String questionAskedTime; // time at which the question was asked
#Column(name = "questionlastactivetime")
private String questionLastActiveTime; // time at which the question was
// active the last time
#Column(name = "questionvotes")
private int questionVotes; // number of votes on the question
#Column(name = "acceptedanswerstatus")
private String acceptedAnswerStatus; // whether the question has an accepted
// answer
#Column(name = "questionlink")
private String questionLink;
public Question() {
}
public Question(String postedBy, String title, String content, String code, int views_count, int answer_count,
String tag, String questionAskedTime, String questionLastActiveTime, int questionVotes,
String acceptedAnswerStatus, String questionLink, String postedByUsername) {
super();
this.title = title;
this.content = content;
this.code = code;
this.views_count = views_count;
this.answer_count = answer_count;
this.tag = tag;
this.questionAskedTime = questionAskedTime;
this.questionLastActiveTime = questionLastActiveTime;
this.questionVotes = questionVotes;
this.acceptedAnswerStatus = acceptedAnswerStatus;
this.questionLink = questionLink;
this.postedByUsername = postedByUsername;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public int getViews_count() {
return views_count;
}
public void setViews_count(int views_count) {
this.views_count = views_count;
}
public int getAnswer_count() {
return answer_count;
}
public void setAnswer_count(int answer_count) {
this.answer_count = answer_count;
}
public String getTags() {
return tag;
}
public void setTag(String tag) {
this.tag = tag;
}
public String getQuestionAskedTime() {
return questionAskedTime;
}
public void setQuestionAskedTime(String questionAskedTime) {
this.questionAskedTime = questionAskedTime;
}
public String getQuestionLastActiveTime() {
return questionLastActiveTime;
}
public void setQuestionLastActiveTime(String questionLastActiveTime) {
this.questionLastActiveTime = questionLastActiveTime;
}
public int getQuestionVotes() {
return questionVotes;
}
public void setQuestionVotes(int questionVotes) {
this.questionVotes = questionVotes;
}
public String getAcceptedAnswerStatus() {
return acceptedAnswerStatus;
}
public void setAcceptedAnserStatus(String acceptedAnswerStatus) {
this.acceptedAnswerStatus = acceptedAnswerStatus;
}
public String getPrKey() {
return prKey;
}
public void setPrKey(String prKey) {
this.prKey = prKey;
}
public String getPostedByUsername() {
return postedByUsername;
}
public void setPostedByUsername(String postedByUsername) {
this.postedByUsername = postedByUsername;
}
public String getQuestionLink() {
return questionLink;
}
public void setQuestionLink(String questionLink) {
this.questionLink = questionLink;
}
}
And yes I have data in the table. What am I doing wrong, and how can I resolve it?
I have tried adding #Modifying too, still it throws the same error.
Edit
I have used the UPDATE Query to update other fields in a different table and it works, don't know why this doesn't work.
questionVoteRepository.vote("true", "false", questionVote.getQuestionPrKey(),questionVote.getUserPrKey());
check the above line of code in the method upvoteQuestion which added above, this lines works perfectly, updating the question_votes table.
The QuestionVote POJO looks like this:
package com.demo.beans;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;
#Entity
#Table(name="question_votes")
public class QuestionVote {
#Id
#GeneratedValue(generator = "uuid")
#GenericGenerator(name = "uuid", strategy = "uuid2")
#Column(name = "PR_KEY")
private String prKey;
#Column(name="question_pr_key")
private String questionPrKey;
#Column(name="user_pr_key")
private String userPrKey;
#Column(name="upvote")
private String upvote;
#Column(name="downvote")
private String downvote;
public QuestionVote() {
}
public QuestionVote(String prKey, String questionPrKey, String userPrKey, String upvote, String downvote) {
super();
this.prKey = prKey;
this.questionPrKey = questionPrKey;
this.userPrKey = userPrKey;
this.upvote = upvote;
this.downvote = downvote;
}
public String getPrKey() {
return prKey;
}
public void setPrKey(String prKey) {
this.prKey = prKey;
}
public String getQuestionPrKey() {
return questionPrKey;
}
public void setQuestionPrKey(String questionPrKey) {
this.questionPrKey = questionPrKey;
}
public String getUserPrKey() {
return userPrKey;
}
public void setUserPrKey(String userPrKey) {
this.userPrKey = userPrKey;
}
public String getUpvote() {
return upvote;
}
public void setUpvote(String upvote) {
this.upvote = upvote;
}
public String getDownvote() {
return downvote;
}
public void setDownvote(String downvote) {
this.downvote = downvote;
}
}
When a question is added I add a row in the question_votes table too and set the upvote and downvote column for that row as false, false. When the question is upvoted I update the two tables questions and question_votes the question_votes table gets updated successfully but the questions table doesn't gets updated.
The QuestionVoteRepository looks like this:
package com.demo.beans.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import com.demo.beans.QuestionVote;
#Repository
public interface QuestionVoteRepository extends JpaRepository<QuestionVote, Long>{
#Query(value = "SELECT exists (SELECT 1 from question_votes where question_pr_key=:question_pr_key and user_pr_key=:user_pr_key)", nativeQuery=true)
public String checkWhetherRowExists(#Param("question_pr_key") String questionPrKey,
#Param("user_pr_key") String userPrKey);
#Query(value = "SELECT upvote from question_votes where question_pr_key=:question_pr_key and user_pr_key=:user_pr_key", nativeQuery=true)
public String checkUpvote(#Param("question_pr_key") String questionPrKey, #Param("user_pr_key") String userPrKey);
#Query(value = "SELECT downvote from question_votes where question_pr_key=:question_pr_key and user_pr_key=:user_pr_key", nativeQuery=true)
public String checkDownvote(#Param("question_pr_key") String questionPrKey, #Param("user_pr_key") String userPrKey);
#Query(value = "UPDATE question_votes SET upvote=:upvote, downvote=:downvote where question_pr_key=:question_pr_key and user_pr_key=:user_pr_key", nativeQuery=true)
public void vote(#Param("upvote") String upvote, #Param("downvote") String downvote,
#Param("question_pr_key") String questionPrKey, #Param("user_pr_key") String userPrKey);
}

You need to add #Modifying to changeVotes method in the repository to mark that this is an update query and no results are expected back.
https://docs.spring.io/spring-data/jpa/docs/current/api/org/springframework/data/jpa/repository/Modifying.html