So, there already is a way to generate an implementation of a class in IntelliJ (v11), but it is rather simple.
It will create a class with all the methods necessary to satisfy the interface. These methods are empty and return null where appropriate.
What I am looking for is a plugin or something that will generate beans from a interface. If the generator sees a method getXXXX or setXXX (or isXXX) in the interface, it will create a member of that type and get or return that member, respectively in the implemented class.
All you can do is create a new class that implements the interface, then tell IntelliJ to implement all the methods. From that point, it’s up to you to fill in the meat of the methods. There’s no magic that I know of.