Spring boot find autowired on another package

Question

I'm developing a Spring Boot application which uses some Spring Data Repository interfaces:

package test; @SpringBootApplication public class Application implements CommandLineRunner {      @Autowired     private  BookRepository repository;     . . . } 

I can see that the BookRepository interface (which follows here) can only be injected if it's in the same package as the Application class:

package test; public interface BookRepository extends MongoRepository<Book, String> {      public Book findByTitle(String title);     public List<Book> findByType(String type);     public List<Book> findByAuthor(String author);  } 

Is there any Spring Boot annotation I can apply on my classes to be able to find the BookRepository in another package ?

Answer 1

Use a Spring @ComponentScan annotation alongside the SpringBoot @SpringBootApplication and configure a custom base package (you can either specify a list of package names or a list of classes whose package will be used), so for example

@SpringBootApplication @ComponentScan(basePackages = {"otherpackage", "..."}) public class Application 

or

@SpringBootApplication @ComponentScan(basePackageClasses = {otherpackage.MyClass.class, ...}) public class Application 

or since Spring 1.3.0 (Dec. 2016), you can directly write:

@SpringBootApplication(scanBasePackageClasses = {otherpackage.MyClass.class, ...}) public class Application 

Note that component scan will find classes inside and below the given packages.