[JAVA3D] Collision detection question

[Carsten Friedrich]

I want to do something quite simple and I'm not sure how to do it. I have an scene object which is a combination of a Cylinder and several Cones. Each Cone intersects the cylinder by construction. I now want to write a behavior that changes the color of a cone if that Cone collides with any other object in the scene (apart from the Cylinder). I get a wakeupOnCollisionEntry when starting my program for each cone. I suspect this is the collision  with the Cylinder. Due to the Java3D limitation I cannot get further wakeupOnCollisionEntry as the collision with the cylinder never stops. I tried to fix this problem by calling setCollidable(false) on the Cylinder, but it does not seem to have any effect. What am I doing wrong?   Thanks, Carsten