Spring Data JPA without Spring Boot

Question

Spring Boot doesn\'t work with Google App Engine (at least not for me).

However much of the examples written or available in the GitHub or other repositorie

Answer 1

Just created this example for you:

src/main/webapp/WEB-INF/spring/context.xml

    

    

    

    
    
        
        
        
        
            
                ${hibernate.dialect}
            
        
        
    

    
    
        
    

    

    
    

/src/main/webapp/WEB-INF/spring/jdbc.properties

# JDBC Connection
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://host:3306/db
jdbc.username=user
jdbc.password=password
hibernate.dialect=org.hibernate.dialect.MySQLDialect

/src/main/webapp/WEB-INF/spring/servlet-context.xml

web.xml

    
        contextConfigLocation
        /WEB-INF/spring/context.xml
    
    
        webAppRootKey
        demo_jpa
    

    
        org.springframework.web.context.ContextLoaderListener
    
    
        appServlet
        org.springframework.web.servlet.DispatcherServlet
        
            contextConfigLocation
            /WEB-INF/spring/servlet-context.xml
        
        1
    
    
        appServlet
        /
    

pom.xml

    4.1.7.RELEASE
    4.3.8.Final
    1.9.0.RELEASE
    1.4
    5.1.28
    UTF-8



    
        org.springframework
        spring-context-support
        ${org.springframework-version}
    

    
        org.springframework
        spring-webmvc
        ${org.springframework-version}
    

    
        org.springframework.data
        spring-data-jpa
        ${org.springframework.data-version}
    

    
        org.hibernate
        hibernate-entitymanager
        ${org.hibernate-em-version}
    

    
        mysql
        mysql-connector-java
        ${mysql-connector-version}
    

    
        commons-dbcp
        commons-dbcp
        ${dbcp-version}
    

Data Entity: com.demo.data.User

package com.demo.data;

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 = "SYS_USERS")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "USER_ID")
    private int id;

    @Column(name = "USER_NAME")
    private String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Spring Data JPA Repository: com.demo.data.UserRepository

package com.demo.data;

import org.springframework.data.repository.CrudRepository;

public interface UserRepository extends CrudRepository {
}

Service

Interface:

package com.demo.svc;

import com.demo.data.User;

public interface UserService {
    User findUserById(Integer id);
}

Implementation:

package com.demo.svc;

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

import com.demo.data.User;
import com.demo.data.UserRepository;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    UserRepository userRepository;

    public User findUserById(Integer id) {
        return userRepository.findOne(id);
    }
}

Web Controller: com.demo.web.UserController

package com.demo.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.demo.svc.UserService;

@Controller
public class UserController {
    @Autowired
    UserService svc;

    @RequestMapping("/")
    @ResponseBody
    public String test() {
        return svc.findUserById(1).getName();
    }
}