I can never remember how to do this, so this is just a placeholder for exposing memory utilization in JBOSS.
c:\jboss-eap-5.1.2\jboss-eap-5.1\jboss-as\bin>twiddle.bat -u admin -p admin get
jboss.system:type=ServerInfo | findstr Memory
MaxMemory=3579183104
TotalMemory=3087007744
FreeMemory=2852457960
c:\jboss-eap-5.1.2\jboss-eap-5.1\jboss-as\bin>