Guice

I like Guice as it fully supports generic. Also, there is no need to provide auto wiring at any place.

Guice is the best di library to grasp concepts about inversion of control and dependency injection; other libraries (ie spring) relays heavily on annotations hidding much of the di concepts under cryptic annotations. Guice is mostly declarative and code is self-explanatory

Guice injection and AOP features are great.but i fell in awe with guice when used Guice jpa integration and seen Aop being used in real time