java version \"1.5.0_14\"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_14-b03)
Java HotSpot(TM) Server VM (build 1.5.0_14-b03, mixed mode)
Why not keep the class in memory then see if it still happens, if it does then your problem lies elsewhere. If not then you know the issue lies in garbage collection.