Are you sure they are caused by GC? I'm asking because GC is an easy "culprit" and when a Java app pauses / jitters, many people immediately blame it on GC without any hard evidence. While in fact pauses / unresponsiveness can be caused by many other reasons, not specific to JVM (e.g. improper thread locking, improper use of dynamic data structures, doing hard work on the GUI thread, etc.). Actually, a well coded game should not use dynamic memory allocation in the game loop, neither in Java nor in C++.
