How to Add Custom Methods to Spring Data JPA Repositories?

Adding Custom Methods to Spring Data JPA

Spring Data JPA provides out-of-the-box CRUD and finder methods for your entities. To extend these capabilities with custom methods, here's how you do it:

Creating a Custom Method Interface

Your repository interface, like the AccountRepository example, handles default functionality. To add custom methods, create a separate interface that extends the custom method interface:

public interface AccountRepositoryCustom {
    public void customMethod();
}

Custom Method Implementation

Provide an implementation class for the custom method interface:

public class AccountRepositoryImpl implements AccountRepositoryCustom {

    @Autowired
    @Lazy
    AccountRepository accountRepository;  // Optional if needed

    public void customMethod() { ... }
}

Repository with Custom Methods

Your repository interface now extends the custom interface:

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

Resources:

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

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