AttachNotSupportedException occurs in Unix, not in Windows

I'm developing a cross-platform, distributed computing software suite in 100% pure java and am using the VirtualMachine class to do CPU usage monitoring on each node in the network (by getting the cpu time of each thread in each running jvm - I can do this because there is a one-to-one correspondence between nodes and processors on each individual machine). This works just fine in the Windows environment, but when run from Unix, I get the following exception:
com.sun.tools.attach.AttachNotSupportedException: no providers installed
at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:190)
That's the only message I get. As said before, this works just fine in Windows. I'm currently running JDK 1.6.0_12 in Windows and 1.6.0_3 in Unix. I think I'm going to try updating 1.6.0_3 tomorrow to see if this works, but I kinda doubt that it would be an issue. Any ideas?
Ben

The "configuration" which I was guessing at was this:
no providers installedBut I see you're working with Sun's code, and that may mean that Sun hasn't provided any of these providers, whatever they are. Or it may mean that you haven't done something to make those providers available. At any rate, since it's undocumented com.sun classes you're working with, it looks like you're pretty much out of luck.

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