It's most likely that you need to have -d64 on the command line to get a
64-bit hotspot VM.
I still think you are using a 32-bit JVM. Maybe the version of the JRE is
1.6.0_27-b04?
About the options... from java -help:
-d32 use a 32-bit data model if available
-d64 use a 64-bit data model if available
3G Heapspace is more than you need for your messaging load.
I would change the -Xmx to 500M maximum.
Finally, I say, use the defaults unless you have reason to do otherwise.
For sure, you don't need to change from the default GC behaviour in 1.6.0
for this messaging case.
-----
Michael Hayes B.Sc. (NUI), M.Sc. (DCU), SCSA SCNA
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