I'm making weapon like hl2, I "send" ray to x and y of mouse and i return a objectcontroller (like mouse wheel example in jiglibx), How can I attract object to the camera or apply force for came object ?
You need to add a world force to the object. This part is pretty easy, subtract the found object's location from a point just in front of the camera location and use that as your force. If you apply the difference each frame, the object will stop and hold at that point.
The tricky detail is that you need to add any forces from inside a PhysicsController object, during its update loop. Check the tutorials for an example.