CODEWITHSUNDEEP
javaspringconfiguration
wheeleruniverse
wheeleruniverse

Reputation: 1625

How to separate my Spring JPA configuration between numerous JARs?

I have a use-case that I need to separate my Spring configuration into 2 completely separate applications.

Application #1 will contain DAO models with Hibernate Mappings, JPA Repositories, DTO models, and logic to convert from a DAO to a DTO.

Application #2 will contain the RESTful Controllers and Service classes that contain all the business logic.

Application #1 configuration: 

// For application startup
package com.appone.pkg.one

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

// For global configuration files across numerous projects
package com.appone.pkg.two

@Configuration
public class GlobalAppConfig {

    @Bean
    MapperFacade mapperFacade() {
        MapperFactory factory = new DefaultMapperFactory.Builder().build();

        factory.classMap(Group.class, GroupDTO.class).byDefault().register();
        factory.classMap(Role.class, RoleDTO.class).byDefault().register();
        factory.classMap(User.class, UserDTO.class).byDefault().register();

        return factory.getMapperFacade();
    }
 }

// For configuration aspects important for 1 project in particular
package com.appone.pkg.three

@Configuration
@EnableJpaRepositories("com.pkg.three.jpa.repository")
public class AppTwoConfig {

    @Autowired
    private EntityManager em;
    private RepositoryFactorySupport factorySupport;

    private void initialize(){
        if(factorySupport == null){
            factorySupport = new JpaRepositoryFactory(em);
        }
    }

    @Bean
    GroupRepository groupRepository(){
        initialize();
        return factorySupport.getRepository(GroupRepository.class);
    }
    @Bean
    RoleRepository roleRepository(){
        initialize();
        return factorySupport.getRepository(RoleRepository.class);
    }
    @Bean
    UserRepository userRepository(){
        initialize();
        return factorySupport.getRepository(UserRepository.class);
    }
    @Bean
    GroupValidator groupValidator(){
        return new GroupValidator();
    }
    @Bean
    UserValidator userValidator(){
        return new UserValidator();
    }
    @Bean
    ResourceMapper resourceMapper(){
        return new ResourceMapper();
    }
}

Application #2 configuration: 

package com.apptwo.pkg.one;

@SpringBootApplication
@EnableAutoConfiguration
@EntityScan(basePackageClasses = {com.appone.pkg.three.AppTwoConfig.class})
public class ApplicationTwo {
    public static void main(String[] args) {
        SpringApplication.run(ApplicationTwo.class, args);
    }
}

Application #2 data load: 

package com.apptwo.pkg.two;

@Component
public class DataLoader implements ApplicationRunner {

    @Autowired
    private GroupRepository groupRepository;
    @Autowired
    private RoleRepository roleRepository;
    @Autowired
    private UserRepository userRepository;
    @Autowired
    private ResourceMapper resourceMapper;

    /**
     * Loads initial data into the h2 database.
     */
    public void run(ApplicationArguments args) {
        // Load the initial data ... 
    }
}

This is the exception I am getting when I try to launch Application #2. Application #1 starts up fine on it's own, but I am not using the Repositories there and believe it could throw errors if I tried. Ultimately I want the logic only in Application #2 though. Do you have any ideas on what I am doing wrong?

I need to initialize all the dependencies in Application #1 configuration and then run that configuration from inside Application #2 before I run the Application #2 configuration.

Description: Field groupRepository in com.apptwo.pkg.two.DataLoader required a bean of type 'com.appone.pkg.three.jpa.repository.GroupRepository' that could not be found.

Action: Consider defining a bean of type 'com.appone.pkg.three.jpa.repository.GroupRepository' in your configuration.

Upvotes: 1

Views: 1199

Answers (2)

wheeleruniverse
wheeleruniverse

Reputation: 1625

Thanks to a combination of people I found a solution.

Part of the help came from this post: Can't Autowire @Repository annotated interface in Spring Boot

Step #1:

Removed the Application.class from Application #1 so that it cannot be run as a stand-alone Spring Boot App.

Step #2:

I changed AppTwoConfig.java like so, 

// For configuration aspects important for 1 project in particular
package com.appone.pkg.three

@Configuration
@EnableJpaRepositories("com.pkg.three.jpa.repository")
@EntityScan("com.pkg.three.jpa.model")
public class AppTwoConfig {

    @Bean
    GroupValidator groupValidator(){
        return new GroupValidator();
    }
    @Bean
    UserValidator userValidator(){
        return new UserValidator();
    }
    @Bean
    ResourceMapper resourceMapper(){
       return new ResourceMapper();
    }
}

Step #3:

I changed the Application.java inside of Application #2 that should be run as a Spring Boot app.

package com.apptwo.pkg.one;

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan(basePackageClasses = {
        com.apptwo.pkg.one.config.AppConfig.class,
        com.appone.pkg.two.GlobalAppConfig.class,
        com.appone.pkg.three.AppTwoConfig.class
})
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Upvotes: 2

Jens
Jens

Reputation: 69440

The component Scan only Scans subpackages of com.apptwo.pkg.one. You have to configure the right package in @SpringBootApplication

@SpringBootApplication(basePackages ={"com.appone", "com.apptwo"})

Upvotes: 0

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