Running 64bit Java

You have installed 64bit java but it still does not give you permission to increase -Xms and -Xmx variable beyond 1GB giving failed to initialize Java Virtual Machine.

By default java runs on 32bit.

By default Java runs on 32bit environment. If you want to run java on 64bit Environmen then use argument -d64 . By this way you can run 64bit java.