How Can I Extend Spring Data JPA Repositories with Custom Methods?

Customizing Spring Data JPA with Additional Methods

In Spring Data JPA, you can effortlessly access default CRUD and finder functionalities through a repository interface. Customization of finders is also straightforward. However, when it comes to adding complete custom methods with their implementation, the interface approach becomes limited.

To overcome this, you can create a separate interface to house your custom methods:

public interface AccountRepository 
    extends JpaRepository<Account, Long>, AccountRepositoryCustom { ... }

public interface AccountRepositoryCustom {
    public void customMethod();
}

Next, provide an implementation class for the custom methods interface:

public class AccountRepositoryImpl implements AccountRepositoryCustom {

    @Autowired
    @Lazy
    AccountRepository accountRepository;  /* Optional - if you need it */

    public void customMethod() { ... }
}

With this approach, you can extend the functionality of your Spring Data JPA repository with custom methods while maintaining separation of concerns.

Additional Resources:

• [Custom Repository Implementations](https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.custom-implementations)
• [Naming Scheme Change](https://stackoverflow.com/a/52624752/66686)

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