How to Implement Custom Methods in Spring Data JPA Repositories?

Custom Methods in Spring Data JPA

Spring Data JPA provides comprehensive CRUD and finder functionality by default. However, sometimes you may need to implement custom methods. This article explains how to achieve this.

Understanding the Approach

Spring Data JPA utilizes interfaces to define repository methods. While the default functionality is automatically implemented, custom methods require a different approach.

Creating a Separate Interface for Custom Methods

Instead of implementing custom methods directly in the repository interface, you should create a separate interface named AccountRepositoryCustom:

public interface AccountRepositoryCustom {
    public void customMethod();
}

Extending and Implementing the Interface

Extend the repository interface AccountRepository to include the custom interface:

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

Next, create an implementation class for the AccountRepositoryCustom interface:

public class AccountRepositoryImpl implements AccountRepositoryCustom {

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

    public void customMethod() { ... }
}

Additional Resources

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

Implementations using this approach enable you to define and use custom methods in Spring Data JPA repositories.

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