problem with spring boot component scanning

problem with spring boot component scanning - java

I am writing spring boot application which has two entity classes Teacher and Department. I am using JPA and H2 in-memory database. When i run the application tables are not creating in h2 database. I have specified package to scan using #componentScan annotation but i thinks spring is not finding location of entity classes.
Application class-
package com.H2DatabaseDemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
#SpringBootApplication
#ComponentScan(basePackages="com.H2DatabaseDemo")
public class H2DatabaseDemoApplication {
public static void main(String[] args) {
SpringApplication.run(H2DatabaseDemoApplication.class, args);
}
}
Aauthor Entity-
package com.H2DatabaseDemo.model;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
#Entity
public class Author {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private long id;
private String title;
private String body;
public Author() {}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
}
Post entity-
package com.H2DatabaseDemo.model;
import java.awt.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
#Entity
public class Post {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private long id;
private String name;
public Post() {}
public Post(long id, String name) {
this.id = id;
this.name = name;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Here is my project directory structure
here is my pom.xml file-
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.H2DatabaseDemo</groupId>
<artifactId>H2DatabaseDemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>H2DatabaseDemo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Stack trace-
:: Spring Boot :: (v2.0.4.RELEASE)
2018-09-13 18:00:07.448 INFO 12584 --- [ main] c.H.H2DatabaseDemoApplication : Starting H2DatabaseDemoApplication on DESKTOP-7NILS0D with PID 12584 (D:\springCourse\H2DatabaseDemo\target\classes started by Mrugesh in D:\springCourse\H2DatabaseDemo)
2018-09-13 18:00:07.453 INFO 12584 --- [ main] c.H.H2DatabaseDemoApplication : No active profile set, falling back to default profiles: default
2018-09-13 18:00:07.539 INFO 12584 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#17c1bced: startup date [Thu Sep 13 18:00:07 IST 2018]; root of context hierarchy
2018-09-13 18:00:09.114 INFO 12584 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$934327a5] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-09-13 18:00:09.860 INFO 12584 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-09-13 18:00:09.892 INFO 12584 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-09-13 18:00:09.893 INFO 12584 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.32
2018-09-13 18:00:09.903 INFO 12584 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_171\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_171/bin/server;C:/Program Files/Java/jre1.8.0_171/bin;C:/Program Files/Java/jre1.8.0_171/lib/amd64;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;c:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\nodejs\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\Microsoft VS Code\bin;C:\Program Files\Microsoft VS Code\bin;C:\Users\Mrugesh\AppData\Roaming\npm;C:\Users\Mrugesh\AppData\Local\Microsoft\WindowsApps;C:\Users\Mrugesh\AppData\Local\GitHubDesktop\bin;C:\eclipse;;.]
2018-09-13 18:00:10.046 INFO 12584 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-09-13 18:00:10.047 INFO 12584 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2516 ms
2018-09-13 18:00:10.173 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-09-13 18:00:10.179 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet webServlet mapped to [/console/]
2018-09-13 18:00:10.188 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/]
2018-09-13 18:00:10.189 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/]
2018-09-13 18:00:10.189 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/]
2018-09-13 18:00:10.189 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-09-13 18:00:10.392 INFO 12584 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-09-13 18:00:10.667 INFO 12584 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2018-09-13 18:00:10.733 INFO 12584 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2018-09-13 18:00:10.754 INFO 12584 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2018-09-13 18:00:10.863 INFO 12584 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.2.17.Final}
2018-09-13 18:00:10.864 INFO 12584 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-09-13 18:00:10.910 INFO 12584 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2018-09-13 18:00:11.034 INFO 12584 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2018-09-13 18:00:11.581 INFO 12584 --- [ main] o.h.t.schema.internal.SchemaCreatorImpl : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl#6bcc3f27'
2018-09-13 18:00:11.585 INFO 12584 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-09-13 18:00:11.700 INFO 12584 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [//favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-13 18:00:12.010 INFO 12584 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#17c1bced: startup date [Thu Sep 13 18:00:07 IST 2018]; root of context hierarchy
2018-09-13 18:00:12.060 WARN 12584 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-09-13 18:00:12.147 INFO 12584 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-09-13 18:00:12.149 INFO 12584 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-09-13 18:00:12.183 INFO 12584 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-13 18:00:12.183 INFO 12584 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-13 18:00:12.558 INFO 12584 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-09-13 18:00:12.560 INFO 12584 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Bean with name 'dataSource' has been autodetected for JMX exposure
2018-09-13 18:00:12.565 INFO 12584 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]
2018-09-13 18:00:12.605 INFO 12584 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-09-13 18:00:12.610 INFO 12584 --- [ main] c.H.H2DatabaseDemoApplication : Started H2DatabaseDemoApplication in 5.598 seconds (JVM running for 6.203)

Your entities classes are fine but your H2 console is configured with the default db (testdb if i'm not wrong). You should at least specify the URL in your H2 Console to match your db name or the other way around.
You may try the following approach:
1 In the application.properties file configure H2 console access control:
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
spring.datasource.url=jdbc:h2:mem:hddemo-app
2 Access the db from http://localhost:8080/h2-console/
3 Inside the H2 Console, Copy and paste jdbc:h2:mem:hddemo-app in the JDBC URL field. Leave the password field empty and click the connect button.
4 You should see the entity you specified in your project as a table.

Try configurate
hibernate.hbm2ddl.auto
value to be create by adding following line in the application.properties.
spring.jpa.hibernate.ddl-auto=create
I have the same problem so I tried this and it works.
Hope this helps.

In Spring you have two annotations for scanning:
- ComponentScan for scanning Component annotated classes and generating beans out of them (https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/annotation/ComponentScan.html), and
- EntityScan for generating information for JPA and others for the entities (https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/autoconfigure/domain/EntityScan.html)
In your case, since you are trying to generate entitites and not beans/components, you should use #EntityScan.
N.B.: Spring also supports auto configuration: https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-auto-configuration.html

Related

H2 console doesn't Create Table with Entity Class

Yo, cant resolve this simply problem in h2-console..
I want just create table via Entity class like "MOvie" or "director" but when i open my h2-console,is not created, pls help
POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>sk.wynny</groupId>
<artifactId>springLearn</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springLearn</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
app-properties
spring.h2.console.enabled= true
spring.datasource.url=jdbc:h2:mem:wynny
spring.datasource.username=root
MOVIE CLASS
package sk.wynny.modul;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
#Entity
public class Movie {
#Id
#GeneratedValue
private Long id;
private String name;
public Movie() {
}
public Movie(Long id, String name) {
this.id = id;
this.name = name;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
LOGs
2022-02-13 20:11:37.031 INFO 5856 --- [ main] s.w.springLearn.SpringLearnApplication : Starting SpringLearnApplication using Java 17.0.1 on DESKTOP-K3O8I67 with PID 5856 (C:\Users\Patrik Severín\IdeaProjects\springLearn\target\classes started by Wynny in C:\Users\Patrik Severín\IdeaProjects\springLearn)
2022-02-13 20:11:37.034 INFO 5856 --- [ main] s.w.springLearn.SpringLearnApplication : No active profile set, falling back to default profiles: default
2022-02-13 20:11:37.638 INFO 5856 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2022-02-13 20:11:37.653 INFO 5856 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 5 ms. Found 0 JPA repository interfaces.
2022-02-13 20:11:38.249 INFO 5856 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-02-13 20:11:38.260 INFO 5856 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-02-13 20:11:38.260 INFO 5856 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.56]
2022-02-13 20:11:38.362 INFO 5856 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-02-13 20:11:38.363 INFO 5856 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1281 ms
2022-02-13 20:11:38.398 INFO 5856 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2022-02-13 20:11:38.553 INFO 5856 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2022-02-13 20:11:38.563 INFO 5856 --- [ main] o.s.b.a.h2.H2ConsoleAutoConfiguration : H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:wynny'
2022-02-13 20:11:38.735 INFO 5856 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2022-02-13 20:11:38.789 INFO 5856 --- [ main] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.6.4.Final
2022-02-13 20:11:38.949 INFO 5856 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
2022-02-13 20:11:39.073 INFO 5856 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2022-02-13 20:11:39.263 INFO 5856 --- [ main] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2022-02-13 20:11:39.273 INFO 5856 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2022-02-13 20:11:39.321 WARN 5856 --- [ main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2022-02-13 20:11:39.602 WARN 5856 --- [ main] ion$DefaultTemplateResolverConfiguration : Cannot find template location: classpath:/templates/ (please add some templates or check your Thymeleaf configuration)
2022-02-13 20:11:39.734 INFO 5856 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-02-13 20:11:39.746 INFO 5856 --- [ main] s.w.springLearn.SpringLearnApplication : Started SpringLearnApplication in 3.068 seconds (JVM running for 3.417)
i following many videos or manuals and still have same problem, is here some Hero what can resolve it ? :D

Problem was in Thymeleaf engine, if i create spring only with h2,web and jpa is working nicely.Idk why problem is with Thymeleaf..

SpringBoot RequestMapping method not called

I am learning SpringBoot. using Spring JavaPersistenceAPI(JPA) and apache derby as the database. I am having trouble mapping a URL to a method.
I have Topics:
#Entity
public class Topic {
#Id
private String id;
private String name;
private String description;
public Topic() {
}
public Topic(String id, String name, String description) {
this.id = id;
this.name = name;
this.description = description;
} ... getters & setters...
And I have a Topic controller. It works fine:
#RestController
public class TopicController {
#Autowired
private TopicService topicServ;
#RequestMapping("/topics")
public List<Topic> getAllTopics() {
return topicServ.getAllTopics();
}
#RequestMapping("/topics/{topicId}")
public Topic getTopic(#PathVariable String topicId) {
return topicServ.getTopic(topicId);
}... more methods (they work fine)
Every topic has courses:
#Entity
public class Course {
private String id;
private String name;
private String description;
#ManyToOne
private Topic topic;
public Course() {
}
public Course(String id, String name, String description, String topicId) {
this.id = id;
this.name = name;
this.description = description;
this.setTopic(new Topic(topicId, "CourseConstructorNAME", "CourseConstructorDESCRIPTION"));
} ... getters & setters ...
And I have the courses controller, where I am finding the problem:
#RestController
public class CourseController {
#Autowired
private CourseService courseServ;
#GetMapping(value = "/topics/{topicId}/courses")
public List<Course> getAllCourses(#PathVariable("topicId") String topicId){
System.out.println("Hi"); *<-- does not print anything*
return courseServ.getAllCourses(topicId);
}
The problem is that, issuing a GET request to http://localhost:8080/topics/java/courses , returns a 404 error message:
{
"timestamp": "2018-11-26T19:30:08.871+0000",
"status": 404,
"error": "Not Found",
"message": "No message available",
"path": "/topics/java/courses"
}
I expect a list of courses corresponding to the topic id fetched from the URL. The failure confuses me because the topic controller works fine and it is almost the same.
So, because the sysout I put above doesn't print anything, I must be doing something really dumb; but just in case, here is the code for courseServ:
#Service
public class CourseService {
#Autowired
private CourseRepository courseRepo;
public List<Course> getAllCourses(String topicId){
System.out.println("Calling get all courses from course service");
List<Course> theList = new ArrayList<Course>();
courseRepo.findByTopic_Id(topicId).forEach(theList::add);
System.out.println(theList.toString());
return theList;
}
and here is courseRepo:
public interface CourseRepository extends CrudRepository<Course, String> {
public List<Course> findByTopic_Id(String topicId);
}
Here is the spring console log:
2018-11-26 13:29:25.142 INFO 16252 --- [ main] P.ProjectNameWithJpaApplication : Starting ProjectNameWithJpaApplication on JulioPHX with PID 16252 (C:\SpringToolSuite\workspace\ProjectNameWithJPA\target\classes started by JulioPHX in C:\SpringToolSuite\workspace\ProjectNameWithJPA)
2018-11-26 13:29:25.148 INFO 16252 --- [ main] P.ProjectNameWithJpaApplication : No active profile set, falling back to default profiles: default
2018-11-26 13:29:27.107 INFO 16252 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2018-11-26 13:29:27.238 INFO 16252 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 116ms. Found 1 repository interfaces.
2018-11-26 13:29:28.254 INFO 16252 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$c18d73e6] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-11-26 13:29:29.466 INFO 16252 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-11-26 13:29:29.501 INFO 16252 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-11-26 13:29:29.502 INFO 16252 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/9.0.12
2018-11-26 13:29:29.525 INFO 16252 --- [ main] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_191\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_191/bin/server;C:/Program Files/Java/jre1.8.0_191/bin;C:/Program Files/Java/jre1.8.0_191/lib/amd64;C:\Scripts\;C:\;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Python37\;C:\Python37\Scripts;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\iCLS\;C:\Program Files\Intel\Intel(R) Management Engine Components\iCLS\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Git\cmd;C:\Program Files\RedHat\java-1.8.0-openjdk-1.8.0.161-1\bin;C:\WINDOWS\System32\OpenSSH\;C:\MinGW\bin;C:\Program Files\MicrosoftVSCode\bin;C:\cygwin64\bin;C:\Program Files\apache-maven-3.5.4\bin;C:\Users\JulioPHX\AppData\Local\Microsoft\WindowsApps;;C:\Users\JulioPHX\Microsoft VS Code\bin;C:\SpringToolSuite\sts-bundle\sts-3.9.6.RELEASE;;.]
2018-11-26 13:29:29.773 INFO 16252 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-11-26 13:29:29.774 INFO 16252 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 4461 ms
2018-11-26 13:29:29.852 INFO 16252 --- [ main] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-11-26 13:29:29.861 INFO 16252 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-11-26 13:29:29.862 INFO 16252 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-11-26 13:29:29.862 INFO 16252 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'formContentFilter' to: [/*]
2018-11-26 13:29:29.862 INFO 16252 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-11-26 13:29:30.698 INFO 16252 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-11-26 13:29:30.703 WARN 16252 --- [ main] com.zaxxer.hikari.util.DriverDataSource : Registered driver with driverClassName=org.apache.derby.jdbc.EmbeddedDriver was not found, trying direct instantiation.
2018-11-26 13:29:31.587 INFO 16252 --- [ main] com.zaxxer.hikari.pool.PoolBase : HikariPool-1 - Driver does not support get/set network timeout for connections. (Feature not implemented: No details.)
2018-11-26 13:29:31.596 INFO 16252 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2018-11-26 13:29:31.764 INFO 16252 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2018-11-26 13:29:31.925 INFO 16252 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.3.7.Final}
2018-11-26 13:29:31.929 INFO 16252 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-11-26 13:29:32.247 INFO 16252 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2018-11-26 13:29:32.586 INFO 16252 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.DerbyTenSevenDialect
2018-11-26 13:29:34.603 WARN 16252 --- [ main] o.h.t.s.i.ExceptionHandlerLoggedImpl : GenerationTarget encountered exception accepting command : Error executing DDL "drop table topic" via JDBC Statement
org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "drop table topic" via JDBC Statement
Caused by: java.sql.SQLSyntaxErrorException: Schema 'SA' does not exist
Caused by: org.apache.derby.iapi.error.StandardException: Schema 'SA' does not exist
2018-11-26 13:29:34.718 INFO 16252 --- [ main] o.h.t.schema.internal.SchemaCreatorImpl : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl#74b00247'
2018-11-26 13:29:34.725 INFO 16252 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-11-26 13:29:36.108 INFO 16252 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2018-11-26 13:29:36.251 WARN 16252 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-11-26 13:29:36.757 INFO 16252 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-11-26 13:29:36.763 INFO 16252 --- [ main] P.ProjectNameWithJpaApplication : Started ProjectNameWithJpaApplication in 12.543 seconds (JVM running for 13.617)
2018-11-26 13:29:42.083 INFO 16252 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2018-11-26 13:29:42.084 INFO 16252 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2018-11-26 13:29:42.100 INFO 16252 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 16 ms
2018-11-26 13:29:42.298 INFO 16252 --- [nio-8080-exec-1] o.h.h.i.QueryTranslatorFactoryInitiator : HHH000397: Using ASTQueryTranslatorFactory
And the pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>PackageNameWithJPA</groupId>
<artifactId>ProjectNameWithJPA</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>ProjectNameWithJPA</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Project structure:
Thank you in advance for any help.

I have same problem .It is because your Properties default is set to:
"spring.jpa.hibernate.ddl-auto=create-drop"
change it
in application.properties file.if this not over there add this
"spring.jpa.hibernate.ddl-auto=update"
line in your application.properties file.It work fine.

Even I have encountered the same error while using Apache Derby. This is because of the default properties of spring which is -spring.jpa.hibernate.ddl-auto=create-drop.
Solution: Create an application.properties file in src/main/resources folder and change the property to spring.jpa.hibernate.ddl-auto=update and run the app again, it should work.

The reason being the second controller in package "ProjectNameWithJPA.course" is giving 404 error because spring is not able to scan controller in "ProjectNameWithJPA.course".
By default, Spring-Boot scans the controller under the same package hierarchy like it can be "PackageNameWithJPA.course"
Read this for more understanding spring docs [https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-using-springbootapplication-annotation.html]

You can always define a custom component scan in a spring boot project. By default #SpringBootApplication annotation handles the component scanning for the application. However, let’s say one of the components is defined in another package then you can define in your configuration class like :
#ComponentScan({"com.springboot.basics.springbootPA1","com.springboot.springbootPA2"})
#SpringBootApplication
public class testApplication{

Spring Boot RequestMapping not working on Linux Fedora 26

I recently started using Linux Fedora 26 and wanted to start a Spring Boot Application but it won't recognize #Controller and #RestController annotations with Thymeleaf. My HomeController class's mapping doesn't see my Templates folder and I get a Whiteable Error page / 404.
I have started to build a similar project (https://github.com/alexanderphoen1x/trainingdiary) in my old Windows machine and it seemed to work fine, but when I tried running my old project, I cloned it from github and it gives me an Exception:
Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource
[org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed
I think it might be Linux related?
Project structure:
1. greenenergy
-src/main/java
+com.greenenergy
*GreenEnergyApplication.java
+com.greenenergy.controller
*HomeController.java
-src/main/resources
+static
+templates
*stories.html
+application.properties
(...)
-pom.xml
My code:
GreenEnergyApplication.java:
package com.greenenergy;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class GreenEnergyApplication {
public static void main(String[] args) {
SpringApplication.run(GreenEnergyApplication.class, args);
}
}
HomeController.java:
package com.greenergy.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class HomeController {
#RequestMapping("/")
public String stories() {
return "stories";
}
}
stories.html:
<!DOCTYPE html>
<html>
<title></title>
<head></head>
<body>Hey Alex</body>
</html>
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.greenenergy</groupId>
<artifactId>greenenergy</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Green energy project</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Console:
2018-10-22 17:31:32.580 INFO 5091 --- [ restartedMain] com.greenenergy.GreenEnergyApplication : Starting GreenEnergyApplication on localhost.localdomain with PID 5091 (/home/alexanderp/Projects/greenenergy/greenenergy/target/classes started by alexanderp in /home/alexanderp/Projects/greenenergy/greenenergy)
2018-10-22 17:31:32.581 INFO 5091 --- [ restartedMain] com.greenenergy.GreenEnergyApplication : No active profile set, falling back to default profiles: default
2018-10-22 17:31:32.650 INFO 5091 --- [ restartedMain] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#76dffce0: startup date [Mon Oct 22 17:31:32 CEST 2018]; root of context hierarchy
2018-10-22 17:31:34.411 INFO 5091 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-10-22 17:31:34.438 INFO 5091 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-10-22 17:31:34.439 INFO 5091 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.34
2018-10-22 17:31:34.446 INFO 5091 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : Loaded APR based Apache Tomcat Native library [1.2.16] using APR version [1.6.3].
2018-10-22 17:31:34.447 INFO 5091 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2018-10-22 17:31:34.447 INFO 5091 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
2018-10-22 17:31:34.450 INFO 5091 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : OpenSSL successfully initialized [OpenSSL 1.1.0h-fips 27 Mar 2018]
2018-10-22 17:31:34.546 INFO 5091 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-10-22 17:31:34.546 INFO 5091 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1900 ms
2018-10-22 17:31:34.619 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-10-22 17:31:34.623 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-10-22 17:31:34.624 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-10-22 17:31:34.624 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-10-22 17:31:34.624 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-10-22 17:31:34.785 INFO 5091 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-22 17:31:35.027 INFO 5091 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#76dffce0: startup date [Mon Oct 22 17:31:32 CEST 2018]; root of context hierarchy
2018-10-22 17:31:35.117 INFO 5091 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-10-22 17:31:35.119 INFO 5091 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-10-22 17:31:35.177 INFO 5091 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-22 17:31:35.177 INFO 5091 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-22 17:31:35.425 INFO 5091 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2018-10-22 17:31:35.453 INFO 5091 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-10-22 17:31:35.482 INFO 5091 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-10-22 17:31:35.487 INFO 5091 --- [ restartedMain] com.greenenergy.GreenEnergyApplication : Started GreenEnergyApplication in 3.246 seconds (JVM running for 4.164)
2018-10-22 17:31:40.437 INFO 5091 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-10-22 17:31:40.437 INFO 5091 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2018-10-22 17:31:40.450 INFO 5091 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 12 ms
2018-10-22 17:31:48.845 INFO 5091 --- [ Thread-7] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#76dffce0: startup date [Mon Oct 22 17:31:32 CEST 2018]; root of context hierarchy
2018-10-22 17:31:48.848 INFO 5091 --- [ Thread-7] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown

The Maven dependency could be corrupted during the download. Comment out the Thymeleaf in the POM and save the project. Delete manually the Thymeleaf files on your drive. Put back the Thymeleaf dependency in the POM and save the Project.

My spring-app doesn't receive my GET

So I've been trying to do the example from spring's official guide on connecting Spring with MySQL (https://spring.io/guides/gs/accessing-data-mysql/)
I didn't follow it 100% since I'm using STS for my overall project. The thing is when I use POSTMAN or just my browser to send data
such as :
localhost:8000/demo/add?name=First&email=someemail#someemailprovider.com
I get the error not found.
The java code is the same as in the guide . My application.properties is this:
server.port=8000
spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username=springuser
spring.datasource.password=ThePassword
and my pom.xml is this
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>dbDemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>dbDemo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
The answer from my browser is:
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing
this as a fallback.
Tue Jul 10 21:15:52 EEST 2018
There was an unexpected error (type=Not Found, status=404).
No message available
And from postman :
{
"timestamp": "2018-07-10T18:08:28.208+0000",
"status": 404,
"error": "Not Found",
"message": "No message available",
"path": "/demo/add"
}
The log from spring's console is :
:: Spring Boot :: (v2.0.3.RELEASE)
2018-07-10 20:32:36.453 INFO 7815 --- [ main] com.example.demo.DbDemoApplication : Starting DbDemoApplication on max-kans with PID 7815 (/home/max/Desktop/Fetina/Earino/projectTL/softEngine/dbDemo/target/classes started by max in /home/max/Desktop/Fetina/Earino/projectTL/softEngine/dbDemo)
2018-07-10 20:32:36.496 INFO 7815 --- [ main] com.example.demo.DbDemoApplication : No active profile set, falling back to default profiles: default
2018-07-10 20:32:36.742 INFO 7815 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#2aa5fe93: startup date [Tue Jul 10 20:32:36 EEST 2018]; root of context hierarchy
2018-07-10 20:32:41.650 INFO 7815 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$5ab04215] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-07-10 20:32:42.775 INFO 7815 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8000 (http)
2018-07-10 20:32:43.344 INFO 7815 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-07-10 20:32:43.344 INFO 7815 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.31
2018-07-10 20:32:44.326 INFO 7815 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]
2018-07-10 20:32:47.580 INFO 7815 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-07-10 20:32:47.581 INFO 7815 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 10868 ms
2018-07-10 20:32:48.187 INFO 7815 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-07-10 20:32:48.192 INFO 7815 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-07-10 20:32:48.193 INFO 7815 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-07-10 20:32:48.193 INFO 7815 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-07-10 20:32:48.193 INFO 7815 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-07-10 20:32:50.090 INFO 7815 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-07-10 20:32:54.757 INFO 7815 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2018-07-10 20:32:55.307 INFO 7815 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2018-07-10 20:32:55.640 INFO 7815 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2018-07-10 20:32:58.848 INFO 7815 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.2.17.Final}
2018-07-10 20:32:59.125 INFO 7815 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-07-10 20:33:00.513 INFO 7815 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2018-07-10 20:33:02.175 INFO 7815 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2018-07-10 20:33:03.329 INFO 7815 --- [ main] o.h.t.schema.internal.SchemaCreatorImpl : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl#7a8406c2'
2018-07-10 20:33:03.331 INFO 7815 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-07-10 20:33:06.623 INFO 7815 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-07-10 20:33:08.065 INFO 7815 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#2aa5fe93: startup date [Tue Jul 10 20:32:36 EEST 2018]; root of context hierarchy
2018-07-10 20:33:08.206 WARN 7815 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-07-10 20:33:08.322 INFO 7815 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-07-10 20:33:08.324 INFO 7815 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-07-10 20:33:08.368 INFO 7815 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-07-10 20:33:08.368 INFO 7815 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-07-10 20:33:09.610 INFO 7815 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-07-10 20:33:09.613 INFO 7815 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Bean with name 'dataSource' has been autodetected for JMX exposure
2018-07-10 20:33:09.622 INFO 7815 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]
2018-07-10 20:33:10.003 INFO 7815 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8000 (http) with context path ''
2018-07-10 20:33:10.154 INFO 7815 --- [ main] com.example.demo.DbDemoApplication : Started DbDemoApplication in 35.885 seconds (JVM running for 39.933)
2018-07-10 20:34:07.354 INFO 7815 --- [nio-8000-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-07-10 20:34:07.354 INFO 7815 --- [nio-8000-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2018-07-10 20:34:07.962 INFO 7815 --- [nio-8000-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 608 ms
My controller is pretty much identical to the one from spring's guide :
package hello;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import hello.User;
import hello.UserRepository;
#Controller // This means that this class is a Controller
#RequestMapping(path="/demo")
// This means URL's start with /demo (after Application path)
public class UserController {
#Autowired
// This means to get the bean called userRepository
// Which is auto-generated by Spring, we will use it to handle the data
private UserRepository userRepository;
#GetMapping(path="/add") // Map ONLY GET Requests
public #ResponseBody String addNewUser(#RequestParam String name,
#RequestParam String email) {
// #ResponseBody means the returned String is the response,
// not a view name
User n = new User();
n.setName(name);
n.setEmail(email);
userRepository.save(n);
return "Saved";
}
#GetMapping(path="/all")
public #ResponseBody Iterable<User> getAllUsers() {
// This returns a JSON or XML with the users
return userRepository.findAll();
}
}

Your #SpringBootApplication class is in the package com.example.demo (according to the startup log), but your #Controller is in package hello. By default, Spring Boot won't auto-discover Spring classes that are outside the package the #SpringBootApplication class is in. Either move the UserController somewhere under the com.example.demo, or add #ComponentScan annotation targeting your hello package to the main Spring Boot app class.

How to access h2-console with a Netbeans Spring-Boot project

I'm using spring boot 1.5.4, i'm following a tutorial where it shows that just by adding h2-console to the localhost:8080/ url you can access the console. But when i do that i have a 404 Whitelabel error.
These are the dependencies
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--WebJars-->
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.5</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.2.1</version>
</dependency>
<!--jpa and database-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
And this is the spring boot console log
2017-07-19 01:35:25.222 INFO 8644 --- [ main] c.e.s.SpringBootTest00Application : Starting SpringBootTest00Application on DESKTOP-K8Q0B2R with PID 8644 (started by Talon in C:\Users\Talon\Desktop\java netbeans\01\springBootTest00)
2017-07-19 01:35:25.225 INFO 8644 --- [ main] c.e.s.SpringBootTest00Application : No active profile set, falling back to default profiles: default
2017-07-19 01:35:25.544 INFO 8644 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext#37574691: startup date [Wed Jul 19 01:35:25 CEST 2017]; root of context hierarchy
2017-07-19 01:35:27.236 INFO 8644 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-07-19 01:35:27.248 INFO 8644 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-07-19 01:35:27.249 INFO 8644 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.15
2017-07-19 01:35:27.378 INFO 8644 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-07-19 01:35:27.378 INFO 8644 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1838 ms
2017-07-19 01:35:27.578 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-07-19 01:35:27.582 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-07-19 01:35:27.584 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-07-19 01:35:27.584 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-07-19 01:35:27.584 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-07-19 01:35:28.020 INFO 8644 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2017-07-19 01:35:28.037 INFO 8644 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2017-07-19 01:35:28.122 INFO 8644 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.0.12.Final}
2017-07-19 01:35:28.123 INFO 8644 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2017-07-19 01:35:28.180 INFO 8644 --- [ main] org.hibernate.cfg.Environment : HHH000021: Bytecode provider name : javassist
2017-07-19 01:35:28.219 INFO 8644 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2017-07-19 01:35:28.321 INFO 8644 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2017-07-19 01:35:28.742 INFO 8644 --- [ main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000227: Running hbm2ddl schema export
2017-07-19 01:35:28.757 INFO 8644 --- [ main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000230: Schema export complete
2017-07-19 01:35:28.809 INFO 8644 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2017-07-19 01:35:29.119 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext#37574691: startup date [Wed Jul 19 01:35:25 CEST 2017]; root of context hierarchy
2017-07-19 01:35:29.203 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String com.example.springBootTest00.controllers.IndexController.index()
2017-07-19 01:35:29.205 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product],methods=[POST]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.saveOrUpdateProduct(com.example.springBootTest00.domain.Product)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product/edit/{id}]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.edit(java.lang.Integer,org.springframework.ui.Model)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product/new]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.newProduct(org.springframework.ui.Model)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product/delete/{id}]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.deleteProduct(java.lang.Integer,org.springframework.ui.Model)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/products]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.listProducts(org.springframework.ui.Model)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product/{id}]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.getProduct(java.lang.Integer,org.springframework.ui.Model)
2017-07-19 01:35:29.209 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-07-19 01:35:29.209 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-07-19 01:35:29.243 INFO 8644 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 01:35:29.244 INFO 8644 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 01:35:29.284 INFO 8644 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 01:35:29.920 INFO 8644 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-07-19 01:35:29.983 INFO 8644 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-07-19 01:35:29.987 INFO 8644 --- [ main] c.e.s.SpringBootTest00Application : Started SpringBootTest00Application in 5.052 seconds (JVM running for 5.401)
I have some classes with #Service / #Controller working properly and all the requests are mapped to url strings other than h2-console. Should i import something else in the pom or configure something in application.properties ?

Writing in simple Steps:
In Application.properties file include
spring.h2.console.path=/h2
spring.h2.console.enabled=true
And in pom.xml Include devtools dependency
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
re-package and open http://localhost:[port]/h2 you are all set
other properties you have to include is
spring.datasource.url=jdbc:h2:file:~/h2db
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver
the file h2db will store in userprofile folder of windows
for example : C:\Users\[profile]

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

problem with spring boot component scanning - java

Try configurate hibernate.hbm2ddl.auto value to be create by adding following line in the application.properties. spring.jpa.hibernate.ddl-auto=create I have the same problem so I tried this and it works. Hope this helps.

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