Develop Reference

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..

Trying to save Object in Postgresql database unsuccesfully (no exception)

I try to save object in Postgresql database but unsuccesfully. Application starts normally, no exception is thrown and companiesRepository is not null. The database has been created manually.
This is my Application.class:
#SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
This is my Service.class:
#org.springframework.stereotype.Service
public class Service {
#Autowired
CompaniesRepository companiesRepository;
public void start() {
Companies companies = new Companies();
companies.setSomeString("some");
companies.setId(1);
companiesRepository.save(companies);
log.info("Companies saved in DB");
}
}
This is my Companies.class:
#Entity
#Data
public class Companies {
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Id
Integer id;
String someString;
}
This is my CompaniesRepository interface:
#Repository
public interface CompaniesRepository extends CrudRepository<Companies, Integer> {
}
This is my Controller.class:
#RestController
public class Controller {
#Autowired
private Service service;
#RequestMapping("/")
public String start() throws Exception {
service.start();
return "App Started";
}
}
The configuration I have in bootstrap.yaml file works properly in another project:
spring:
jpa:
database-platform: org.hibernate.dialect.PostgreSQLDialect
show-sql: false
generate-ddl: true
time_zone: UTC
hibernate:
ddl-auto: update
properties:
hibernate:
dialect: org.hibernate.dialect.PostgreSQLDialect
hbm2ddl:
auto: update
jdbc:
lob:
non_contextual_creation: true
enable_lazy_load_no_trans: true
datasource:
url: jdbc:postgresql://localhost:5432/dos?createDatabaseIfNotExist=true&serverTimezone=UTC
driver-class-name: org.postgresql.Driver
username: "postgres"
password: "123"
initialization-mode: always
hibernate:
dialect: org.hibernate.dialect.PostgreSQLDialect
jdbc:
time_zone: UTC
I tried to:
annottate String and id in Companies.class with #Column(nullable = false),
changed table name for Companies.class with #Table(name = "some_table").
add #Autowired CompaniesRepository repository; in Controller.class
EDIT:
Those are the console logs:
2020-03-07 15:35:11.620 INFO 2484 --- [ main] com.xtb.tradebot.Application : Starting Application on MWNB00049 with PID 2484 (C:\Users\Piotr\Documents\trade-bot\trade-bot\target\classes started by Piotr in C:\Users\Piotr\Documents\trade-bot\trade-bot)
2020-03-07 15:35:11.622 INFO 2484 --- [ main] com.xtb.tradebot.Application : No active profile set, falling back to default profiles: default
2020-03-07 15:35:12.179 INFO 2484 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2020-03-07 15:35:12.255 INFO 2484 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 63ms. Found 1 JPA repository interfaces.
2020-03-07 15:35:12.638 INFO 2484 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-03-07 15:35:13.123 INFO 2484 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-03-07 15:35:13.137 INFO 2484 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-03-07 15:35:13.137 INFO 2484 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.30]
2020-03-07 15:35:13.226 INFO 2484 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-03-07 15:35:13.226 INFO 2484 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1563 ms
2020-03-07 15:35:13.390 INFO 2484 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-03-07 15:35:13.673 INFO 2484 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-03-07 15:35:13.735 INFO 2484 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-03-07 15:35:13.830 INFO 2484 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.4.10.Final}
2020-03-07 15:35:13.995 INFO 2484 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
2020-03-07 15:35:14.131 INFO 2484 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2020-03-07 15:35:14.731 INFO 2484 --- [ main] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2020-03-07 15:35:14.735 INFO 2484 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2020-03-07 15:35:15.011 WARN 2484 --- [ 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
2020-03-07 15:35:15.134 INFO 2484 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-03-07 15:35:15.369 INFO 2484 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-03-07 15:35:15.371 INFO 2484 --- [ main] com.xtb.tradebot.Application : Started Application in 4.035 seconds (JVM running for 4.357)
Logs after controller "/" endpoint called:
2020-03-07 16:28:40.365 INFO 20336 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-03-07 16:28:40.365 INFO 20336 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-03-07 16:28:40.374 INFO 20336 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 9 ms
This is 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 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>2.2.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.xtb</groupId>
<artifactId>trade-bot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>trade-bot</name>
<description>trade-bot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

I deleted h2.database dependency and I added:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
And I added in bootstrap.yaml:
spring:
main:
allow-bean-definition-overriding: true
And now it works fine.

Rest controller not mapping in spring boot

My application runs but nothing about mapping is shown in console. My Application class file is above controller and also added #ComponentScan(basePackages : "com.org.name.controller") to scan for controllers. Still no mapping shows up in console. I have commented out #Autowired in controller class as i was getting error of :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-07-12 11:05:16.014 ERROR 14104 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field userService in com.homzhub.lms.controller.UserController required a bean of type 'com.homzhub.lms.service.UserService' that could not be found.
The injection point has the following annotations:
- #org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'com.homzhub.lms.service.UserService' in your configuration.
Main class:
package com.homzhub.lms;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
#SpringBootApplication
#ComponentScan(basePackages = {"com.homzhub.lms.controller"})
//#EnableJpaRepositories("repository")
//#EnableAutoConfiguration
public class LmsApplication{
public static void main(String[] args){
SpringApplication.run(LmsApplication.class, args);
}
}
appointment controller :
package com.homzhub.lms.controller;
import java.security.Principal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.homzhub.lms.entity.Appointment;
import com.homzhub.lms.entity.User;
import com.homzhub.lms.service.AppointmentService;
import com.homzhub.lms.service.UserService;
#Controller
#RequestMapping(path = "/appointment")
public class AppointmentController {
// #Autowired
private AppointmentService appointmentService;
//#Autowired
private UserService userService;
#RequestMapping(value = "/create", method = RequestMethod.GET)
public void createAppointment(Model model) {
Appointment appointment = new Appointment();
model.addAttribute("appointment", appointment);
model.addAttribute("dateString", "");
}
#RequestMapping(value = "/create", method = RequestMethod.POST)
public String createAppointmentPost(#ModelAttribute("appointment") Appointment appointment, #ModelAttribute("dateString") String date, Model model, Principal principal) throws ParseException {
SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd hh:mm");
Date d1 = format1.parse(date);
appointment.setDate(d1);
User user = userService.findByUsername(principal.getName());
appointment.setUser(user);
appointmentService.createAppointment(appointment);
return "redirect:/userFront";
}
}
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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<!-- <version>1.5.21.RELEASE</version> -->
<version>2.1.6.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.homzhub</groupId>
<artifactId>lms</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>lms</name>
<description>Lead Management System</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</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-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Console output. After commenting out #Autowired in controller classes the application runs but no mapping is done :
2019-07-12 12:58:04.638 INFO 18828 --- [ main] com.homzhub.lms.LmsApplication : Starting LmsApplication v0.0.1-SNAPSHOT on rms-Lenovo-ideapad-330-15IKB with PID 18828 (/home/rms/lms/target/lms-0.0.1-SNAPSHOT.jar started by rms in /home/rms/lms)
2019-07-12 12:58:04.644 INFO 18828 --- [ main] com.homzhub.lms.LmsApplication : No active profile set, falling back to default profiles: default
2019-07-12 12:58:05.941 INFO 18828 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2019-07-12 12:58:06.161 INFO 18828 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 204ms. Found 13 repository interfaces.
2019-07-12 12:58:06.849 INFO 18828 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$d931452d] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-07-12 12:58:07.301 INFO 18828 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-07-12 12:58:07.350 INFO 18828 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-07-12 12:58:07.350 INFO 18828 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.21]
2019-07-12 12:58:07.484 INFO 18828 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-07-12 12:58:07.484 INFO 18828 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2751 ms
2019-07-12 12:58:07.952 INFO 18828 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2019-07-12 12:58:08.286 INFO 18828 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2019-07-12 12:58:08.388 INFO 18828 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2019-07-12 12:58:08.519 INFO 18828 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.3.10.Final}
2019-07-12 12:58:08.521 INFO 18828 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2019-07-12 12:58:08.773 INFO 18828 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2019-07-12 12:58:09.175 INFO 18828 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2019-07-12 12:58:10.967 INFO 18828 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2019-07-12 12:58:12.284 INFO 18828 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2019-07-12 12:58:12.364 WARN 18828 --- [ 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
2019-07-12 12:58:12.923 INFO 18828 --- [ main] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page template: index
2019-07-12 12:58:13.211 INFO 18828 --- [ main] .s.s.UserDetailsServiceAutoConfiguration :
Using generated security password: f1e93a8f-d01a-4050-8724-87ff348fab02
2019-07-12 12:58:13.388 INFO 18828 --- [ main] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: any request, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter#1dcca8d3, org.springframework.security.web.context.SecurityContextPersistenceFilter#6daf2337, org.springframework.security.web.header.HeaderWriterFilter#70e3f36f, org.springframework.security.web.csrf.CsrfFilter#3c7cfcbb, org.springframework.security.web.authentication.logout.LogoutFilter#7d755813, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter#4e25147a, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter#60e5272, org.springframework.security.web.authentication.ui.DefaultLogoutPageGeneratingFilter#5631962, org.springframework.security.web.authentication.www.BasicAuthenticationFilter#56303475, org.springframework.security.web.savedrequest.RequestCacheAwareFilter#250b236d, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter#432034a, org.springframework.security.web.authentication.AnonymousAuthenticationFilter#52a70627, org.springframework.security.web.session.SessionManagementFilter#23e44287, org.springframework.security.web.access.ExceptionTranslationFilter#1bfe3203, org.springframework.security.web.access.intercept.FilterSecurityInterceptor#71870da7]
2019-07-12 12:58:13.517 INFO 18828 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2019-07-12 12:58:13.520 INFO 18828 --- [ main] com.homzhub.lms.LmsApplication : Started LmsApplication in 9.518 seconds (JVM running for 10.158)
UserService class :
package com.homzhub.lms.service;
import java.util.List;
import java.util.Set;
import org.springframework.stereotype.Service;
import com.homzhub.lms.entity.User;
import com.homzhub.lms.security.UserRole;
//#Service("userDetailsService")
#Service
public interface UserService{
User findByUsername(String username);
User findByEmail(String email);
// User findByPhoneNumber(String phoneNumber);
boolean checkUserExists(String username, String email);
boolean checkUsernameExists(String username);
boolean checkEmailExists(String email);
void save(User user);
User createUser(User user, Set<UserRole> userRoles);
User saveUser(User user);
List<User> findUserList();
void enableUser(String username);
void disableUser(String username);
}

If it isn't already, you need to define UserService as a Component, or more appropriately as a Service. If it already is you have to map it, which is a bit weird considering Spring should do that on its own.

Your are only scanning com.homzhub.lms.controller and UserService is not under ComponentScan.
You need to add service package to ComponentScan
#ComponentScan(basePackages = {"com.homzhub.lms"})

You service is under com.homzhub.lms.service package so you have to add this package to #ComponentScan too, so Spring will scan this package too and pick up the classes marked with stereotypes there :
#SpringBootApplication
#ComponentScan(basePackages = {"com.homzhub.lms.controller, "com.homzhub.lms.service"})
public class LmsApplication{
public static void main(String[] args){
SpringApplication.run(LmsApplication.class, args);
}
}
However I can see that your class annotated with #SpringBootApplication is already above all the packages with your components so you could get rid of #ComponentScan annotation at all. So it will scan nested packages by default.
And also remember about annotating your service classes with Spring stereotypes annotations for example #Service so component scan will be able to pick them up.

Uncomment #Autowired annotation. Put #Service annotation on the implementing class instead of the interface and make sure your implementing class is discover-able via componentScan. Also, as a side note, Spring will scan all subpackages of your main class (class with #SpringBootApplication annotation). So it would be a good idea to have a directory structure like com.homzhub.lms as a root and com.homzhub.lms.controller for controllers com.homzhub.lms.service for service and com.homzhub.lms.service.impl if you want to keep implementations in a different package. If you are following this structure, you won't need componentScan.

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{

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.