-Xms1024M
-Xmx4096M
-Xss2m
-XX:MaxPermSize=1024M
-XX:ReservedCodeCacheSize=256M
-XX:+TieredCompilation
-XX:+CMSPermGenSweepingEnabled
-XX:+CMSClassUnloadingEnabled
-XX:+UseConcMarkSweepGC
-XX:+HeapDumpOnOutOfMemoryError