spring boot中依赖注入失败，基于maven的多模块项目

Question

Hi friends i am developing a maven based spring boot project project , this project is multiple module form one module is Main module and second module is Service Module. I have one controller in Main module and one service in Serivce module

Controller

package com.aquevix.controller;

import com.aquevix.common.MyService;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.inject.Inject;

/**
 * Created by mohdqasim on 11/9/15.
 */
@RestController
@RequestMapping("/api")
public class MyController {

    @Inject MyService myService;
    @Inject BookRepository bookRepository;
    @RequestMapping(value = "/data" , method = RequestMethod.GET)
    public String getData(){
     return myService.getData();
    }
}

Service

package com.aquevix.common;

import org.springframework.stereotype.Service;

/**
 * Created by mohdqasim on 11/9/15.
 */
@Service
public class MyService {
    public String getData(){
        return "hello qasim";
    }
}

In maven multiple modules this scenerio is working fine but i have also one repository in the form of interface in service module.

package com.aquevix.common;

import org.springframework.data.jpa.repository.*;

/**
 * Spring Data JPA repository for the Book entity.
 */
public interface BookRepository extends JpaRepository<Book,Long> {

}

So when i execute main class from Main module my project works fine without bookrepository in service module( or present in Main module) but if i put bookrepository in Service module then MyController could not instantiate due dependency injection failure of bookRepository in MyController. Can anyone help me how to to avoid this failure i put any interface in Service module which is being injected into Main module

Answer 1

You would need to JavaConfig your repository location like below:

@Configuration
@EnableJpaRepositories("com.aquevix.common")
class ApplicationConfiguration {

  @Bean
  public EntityManagerFactory entityManagerFactory() {
    // …
  }
}

More reference at Working with Spring Data Repositories

Answer 2

I had a similar problem and solved it using this post: Spring Boot: autowire beans from library project

In short, add this annotation to your application:

@Import(SharedConfigurationReference.class)

And then in your Service project create the SharedConfigurationReference class

package com.aquevix.common;

import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@Configuration
@ComponentScan("com.aquevix")
@EnableJpaRepositories("com.aquevix")
@EntityScan("com.aquevix")
public class SharedConfigurationReference {}

For the entity and component scan annotations, make sure to specify a package that is parent to all your projects, ie parent to controller and service