Yes, it is. And it's even desired in the case of CDI
because you can have an interface which represents some service and than have multiple implementations of this service. Each implementation can have it's own qualifier and can be injected into the client by this qualifier, thus hiding it's actual implementation.
Can a CDI bean or JSF Managed bean implement any custom interface
문제
Is it ok to implement other custom interfaces for a CDI or JSF session scoped bean.
해결책
다른 팁
Yes, managed bean can implement custom interface.
제휴하지 않습니다 StackOverflow