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I have this two interfaces and classes: public interface Identifiable<T> { T getId(); } public interface GenericRepository<T extends Identifiable<K>, K> { T get(K id); } public class MyEntity implements Identifiable<Long> { private Long id; public Long getId() { return id; } } public class MyService { private GenericRepository<MyEntity, Long> myEntityRepository; } It all works as desired. But in my opinion second generic parameter in GenericRepository (K) is redundant. Because I know that MyEntity is an Identifiable, I think it would be great if I can finally use it like this: public class MyService { private GenericRepository<MyEntity> myEntityRepository; } But I'm trying different things without succeeding. Is it possible? If not, why not? UPDATE: Answering some responses. I think compiler knows something about which type is the generic in MyEntity. For example: public class MyEntityGenericRepository implements GenericRepository<MyEntity, Long> { // compiles... } public class MyEntityGenericRepository implements GenericRepository<MyEntity, String> { // compiler says: "Bound mismatch: The type MyEntity is not a valid substitute for the bounded parameter <T extends Identifiable<K>> of the type GenericRepository<T,K>" }

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