Java out of memory on 64-bit jvm

Question!

I have got a problem. My program is really big and java is throwing OutOfMemoryException. In .bat file, I have got the following:

java -server -Dfile.encoding=UTF-8 -Xmx1500m -Xbootclasspath/p:../libs/l2ft.jar -cp config/xml;../libs/*; l2ft.gameserver.GameServer

Java is using 6 GB of my RAM, next 6 GB is not used.

I typed System.getProperty("sun.arch.data.model"); and it says that I am using 64-bit JVM.



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