Declare field in class that extends multiple interfaces

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I'm working with QueryDSL and i'm trying to create something "general" to query all my entities, without write predicates for each of them.

Because I'm using JPA, I have interfaces that extends JpaRepository, and because I'm using QueryDSL the interface extends too QueryDslPredicateExecutor

The interface is something like this:

public interface MyUserRepository extends JpaRepository<MyUser, Long>, 
  QuerydslPredicateExecutor<MyUser> {

Now I have a generic service that have a field to access JPA repository:

private JpaRepository<E, ID> repository;

This works but I cant use the method findAll that is described in QuerydslPredicateExecutor.

So the question is, there is a syntax to change private JpaRepository<E, ID> repository; and say that repository extends JpaRepository and QuerydslPredicateExecutor.

More in general a syntax to say that a field extends multiple interfaces, so when I use it i can access to all methods.

Thanks

querydsl java
1 Answers

You could have added the generic type argument to your MyUserRepository interface.

public interface MyUserRepository<E, ID>  extends JpaRepository<E, ID>, 
  QuerydslPredicateExecutor<ID>

Then you could declare your repository object as

private MyUserRepository<E, ID> repository;
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