Solaris: memory not freed after JVM exits - why?

Hi all,
A client of ours has a Java application that appears to leak memory. Yawn, shrug.
However, when the application and the JVM exit, some memory still remains missing, as evidenced by vmstat.
On average, per run of the application 67 MB of memory and 95 MB of swap space 'disappears', eventually rendering the machine unusable. The only way to get the memory back is to reboot the machine.
This baffles me; I'd expect the JVM to return all memory to the free list when it exits.
System: SunOS 5.10 Generic_137111-01 sun4u sparc SUNW,Sun-Fire-15000, 32 GB physical memory.
java version "1.5.0_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05)
Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_05-b05, mixed mode)
Java is invoked with:
java -server -d64 -Xmx20G -Xms20G ...
Has anyone seen this phenomenon before? If so, do you know what causes it? And better yet, is there a known solution for it?
Thanks!
Mark

The old JVM is not my choice. My client has several Java applications running and currently doesn't have the manpower to do the retesting required when employing a newer JVM.
I have asked the supplier of the offending program whether it will run with Java 6. They are currently looking into it.
Mark

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