JPA cant find Entity meta model even if it is present in code - spring-boot

Question

2018-06-04 16:55:38.821 WARN 10092 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'topicController': Unsatisfied dependency expressed through field 'topicService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'topicService': Unsatisfied dependency expressed through field 'topicRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'topicRepository': Cannot create inner bean '(inner bean)#77e80a5e' of type [org.springframework.orm.jpa.SharedEntityManagerCreator] while setting bean property 'entityManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#77e80a5e': Cannot resolve reference to bean 'entityManagerFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available
2018-06-04 16:55:38.840 INFO 10092 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-06-04 16:55:38.884 INFO 10092 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-06-04 16:55:39.082 ERROR 10092 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field topicRepository in com.example.demo.topic.TopicService required a bean named 'entityManagerFactory' that could not be found.
Action:
Consider defining a bean named 'entityManagerFactory' in your configuration.
here is my Entity Class
package com.example.demo.topic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="Topic")
public class TopicPOJO {
#Id
#Column(name = "Id", nullable = false)
String id;
#Column(name = "name", nullable = true)
String name;
#Column(name = "desc", nullable = true)
String description;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public TopicPOJO(String id, String name, String description) {
super();
this.id = id;
this.name = name;
this.description = description;
}
public TopicPOJO() {
super();
}
}
**here is my application**
package com.example.demo.topic;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class DemoJpaApplication {
public static void main(String[] args) {
SpringApplication.run(DemoJpaApplication.class, args);
}
}
Here is My 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.example</groupId>
<artifactId>demo-JPA</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo-JPA</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.2.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-test</artifactId>
<scope>test</scope>
</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>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
here is my interface which extends repository
package com.example.demo.topic;
import org.springframework.data.repository.CrudRepository;
public interface TopicRepository extends CrudRepository<TopicPOJO,String>
{
}
here is my service class
package com.example.demo.topic;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Service;
#Service
public class TopicService {
#Autowired
TopicRepository topicRepository;
public List<TopicPOJO> getAllTopics()
{
List<TopicPOJO> topics=new ArrayList<>();
topicRepository.findAll()
.forEach(topics::add);
return topics;
}
public TopicPOJO getTopic(String id)
{
return topicRepository.findById(id).get();
}
public void addTopic(TopicPOJO topic)
{
topicRepository.save(topic);
}
public void updateTopic(String id,TopicPOJO topic) {
topicRepository.save(topic);
}
public void deleteTopic(String id) {
topicRepository.deleteById(id);
}
}
Here is my Controller
package com.example.demo.topic;
import java.util.List;
import java.util.Arrays;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class TopicController {
#Autowired
TopicService topicService;
#RequestMapping("/topic")
public List<TopicPOJO> getAlltopics()
{
return topicService.getAllTopics();
}
#RequestMapping("/topic/{id}")
public TopicPOJO gettopic(#PathVariable String id)
{
return topicService.getTopic(id);
}
#RequestMapping(method=RequestMethod.POST,value="/topic")
public void addTopic(#RequestBody TopicPOJO topic)
{
topicService.addTopic(topic);
}
#RequestMapping(method=RequestMethod.PUT,value="/topic/{id}")
public void updateTopic(#RequestBody TopicPOJO topic,#PathVariable String
id)
{
topicService.updateTopic(id,topic);
}
#RequestMapping(method=RequestMethod.DELETE,value="/topic/{id}")
public void deleteTopic(#PathVariable String id)
{
topicService.deleteTopic(id);
}
}