Getting to know if JVM is running in 64bit mode

Is it possible to get to know when running an application if the JVM is running in 64 bit mode? So if it is started using -d64 command line option?
Thanks,
Kristof

Add -showversion to the command line and look for
java -Xint -showversion Hello
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Server VM (build 1.6.0-b105, interpreted mode)
If you're running with the JIT, you'll see something like
java -showversion Hello
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)

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Getting to know if JVM is running in 64bit mode

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