Implement custom behaviour to a repository method in spring-data-jpa

Question

I'm trying to implement custom behaviour to a method in Repository using `spring-data-jpa`. The `ProductRepository` interfaces is ``` @Repository public interface ProductRepository extends JpaRepository, ProductRepositoryCustom { public List findByProductName(String productName); } ``` The `ProductRepositoryCustom` interface contain a `saveCustom` to which I want to implement custom behaviour. ``` @Repository public interface ProductRepositoryCustom { public Product saveCustom(Product product); } ``` This is the implementation for `ProductRepositoryCustom` interface. The method `saveCustom` here is just an example. What I really want to do is define a custom method such that it contains a series of instructions involving core `JpaRepository` methods. For that I tried to inject `ProductRepository` instances but I got errors as shown below. ``` public class ProductRepositoryCustomImpl implements ProductRepositoryCustom { @Inject private ProductRepository repo; @Override public Product s…

Accepted Answer

There are two problems with your classes:

remove @Repository annotation from this declaration:

```
@Repository
public interface ProductRepositoryCustom {
```

This will solve your current issue but another one will appear.

The solution to this is to rename

```
ProductRepositoryCustomImpl
```

to

```
ProductRepositoryImpl
```

Implement custom behaviour to a repository method in spring-data-jpa

Solution

Problem