Maximum heap size for 64bit JVM

Hi,
I am trying to set the maximum heap size for a java process in a 64bit JVM . I am not able to set more then 3G
command line config:
java -Xms64m -Xmx3g -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=8000 com.superpages.puboptions.CampaignFeedStarter >> publisher.out 2>&1 &
Hardware / software configs
*$uname -a*
SunOS labsbear 5.9 Generic_122300-19 sun4u sparc SUNW,Sun-Fire-V440
*16GB total physical memory*
*4 processor machine*
*64 bit JVM*
JDK1.6
where is this limitation coming from. How to set the heap size to 6g.
Thanks for your time
Meena

You need to use the -d64 switch to request the 64-bit JVM. E.g.,$ java -showversion -Xmx6g HelloWorld
Invalid maximum heap size: -Xmx6g
The specified size exceeds the maximum representable size.
Could not create the Java virtual machine.
$ java -showversion -d64 -Xmx6g HelloWorld
java version "1.6.0_07"
Java(TM) SE Runtime Environment (build 1.6.0_07-b04)
Java HotSpot(TM) 64-Bit Server VM (build 10.0-b23, mixed mode)
Hello world!

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function(){return A.apply(null,[this].concat($A(arguments)))}
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