Running another program from Java on OSX

I have an application that allows the user to specify an external program to run using the Process class, they just have to xpecify the path.
On OSX most of the apps are in .app packages with the contents hidden to the filechooser. What command do I need to run to start (for example ITunes) an application

Thanks, this is very wierd but compard to other OSes seems to work

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