Java Platform on Linux

We are beginning to port our Java application to Linux and want to 
ensure that we are testing on a configuration that is sufficiently 
"typical" to maximize our chances that it will run for our users.  My 
assumption is that we will use Blackdown Java 1.4.x, but what version 
of Linux is most commonly used to host and/or best suited to to this 
version of Java?  (Perhaps this is a ill-informed question and any 
Linux version can host this implementation of Java.)

Are there known issues with any Linux products and Blackdown Java 
1.4.2?  Where would I find out details?

Finally, two questions about packaging for Java on Linux.  How do I 
go about making Java aware of the window manager under which it is 
being run, so that the style of our widgets can match the hosting 
environment?  I am aware of the SLAF package which contains look and 
feel implementations for some common window managers.  How might I 
detect the currently running WM and instantiate the appropriate look 
and feel?

KDE has the option of using a Mac-style menu bar associated with the 
monitor, rather than associated with each window.  How could I detect 
that the user has this preference set, and make my application 
respond accordingly.

Thanks for any pointers.

-- Dave


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