java.lang.IllegalArgumentException：Spring + Hibernateアプリケーションの不明なエンティティ

Question

Hibernateで小さなStringブートアプリケーションを作成しようとしています。

java.lang.IllegalArgumentException: Unknown entity: com.prithvi.thoughtprocess.beans.dao.impl.User 
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1149) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_51] 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_51] 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_51] 
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_51] 

私はこれをgoogleで検索しましたが、解決策が見つかりませんでした。以下 は私のUserエンティティである -

package com.prithvi.thoughtprocess.beans.domain; 

import java.io.Serializable; 

import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.Table; 

@Entity 
@Table(name="user") 
public class User implements Serializable { 

    /** 
    * 
    */ 
    private static final long serialVersionUID = 3367865397662004005L; 

    @Id 
    @GeneratedValue(strategy = GenerationType.SEQUENCE) 
    @Column(name = "id") 
    private Integer id; 

    @Column(name = "name") 
    private String name; 
    public Integer getId() { 
     return id; 
    } 
    public void setId(Integer id) { 
     this.id = id; 
    } 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    } 

UserDAOImplクラス以下の通りである -

-

package com.prithvi.thoughtprocess.beans.dao.impl; 

import javax.persistence.EntityManager; 
import javax.persistence.PersistenceContext; 

import org.springframework.stereotype.Repository; 

import com.prithvi.thoughtprocess.beans.dao.UserDAO; 
import com.prithvi.thoughtprocess.beans.domain.User; 

@Repository 
public class UserDAOImpl implements UserDAO{ 

    @PersistenceContext 
    private EntityManager entityManager;  

    @Override 
    public <S extends User> S save(S entity) { 
     entityManager.persist(entity); 
     return null; 
    }} 

application.propertiesは以下

spring.datasource.url=jdbc:mysql://localhost:3306/bookbank 
spring.datasource.username=root 
spring.datasource.password=root 
spring.datasource.tomcat.max-wait=20000 
spring.datasource.tomcat.max-active=50 
spring.datasource.tomcat.max-idle=20 
spring.datasource.tomcat.min-idle=15 

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQLDialect 
spring.jpa.properties.hibernate.id.new_generator_mappings = false 
spring.jpa.properties.hibernate.format_sql = true 

logging.level.org.hibernate.SQL=DEBUG 
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE 

ファイルmainメソッドを含むクラスです

import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.EnableAutoConfiguration; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 
import org.springframework.context.annotation.ComponentScan; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RestController; 

import com.prithvi.thoughtprocess.dto.BookDto; 

@ComponentScan(basePackages = {"com.prithvi.thoughtprocess.beans"}) 
@SpringBootApplication 
public class Example { 

    public static void main(String[] args) throws Exception { 
     SpringApplication.run(Example.class, args); 
    } 

} 

コントローラクラス - あなたのアプリケーションクラスに@EntityScan(basePackages = {"com.prithvi.thoughtprocess.beans"}を追加

package com.prithvi.thoughtprocess.beans.service.impl; 

import java.util.ArrayList; 
import java.util.List; 


import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Service; 
import org.springframework.transaction.annotation.Transactional; 

import com.prithvi.thoughtprocess.beans.dao.UserDAO; 
import com.prithvi.thoughtprocess.beans.domain.User; 
import com.prithvi.thoughtprocess.beans.service.UserService; 
import com.prithvi.thoughtprocess.dto.UserDto; 

@Service 
@Transactional 
public class UserServiceImpl implements UserService { 

    @Autowired 
    private UserDAO userDAO; 

    @Override 

    public void saveUser(UserDto userDto) { 
     userDAO.save(convertToEntity(userDto)); 
    } 

    public User convertToEntity(UserDto userDto){ 
     User user = new User(); 
     user.setId(userDto.getId()); 
     user.setName(userDto.getName()); 
     return user; 
    } 

    public UserDto convertToDto(User user){ 
     UserDto userDto = new UserDto(); 
     userDto.setId(user.getId()); 
     userDto.setName(user.getName()); 
     return userDto; 
    } 

    @Override 
    public List<UserDto> listUser() { 
     //List<User> users = userDAO.list(); 
     List<UserDto> userDtos = new ArrayList<>(); 
     /*for (User user : users) { 
      userDtos.add(convertToDto(user)); 
     }*/ 
     return userDtos; 
    } 

} 

Answer 1

- DAO層を呼び出す

package com.prithvi.thoughtprocess.beans.controller; 

import java.util.List; 

import org.springframework.beans.factory.annotation.Autowired; 
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; 

import com.prithvi.thoughtprocess.beans.service.UserService; 
import com.prithvi.thoughtprocess.dto.UserDto; 

@RestController 
public class UserController { 

    @Autowired 
    private UserService userService; 


    @RequestMapping(value = "user/save", method = RequestMethod.POST) 
    String save(@RequestBody UserDto userDto) { 
     userService.saveUser(userDto); 
     return "User save successfully"; 
    } 

    @RequestMapping(value = "user/list", method = RequestMethod.GET) 
    List<UserDto> list() { 
     return userService.listUser(); 
    } 

} 

Serviceクラス。これは、あなたのエンティティをスキャンするために休止状態に必要です。