How to make sure PostScript printer is listed as a PrintService

We have built printing into one of our applications using the PrintService API. The output is generated using PostScript. Everything works fine, except that our QA folks are complaining that not all their printers are showing up in the print dialog. We're getting the list of printers using (effectively):
PrintServiceLookup.lookupPrintServices(DocFlavor.INPUT_STREAM.POSTSCRIPT, null);Generally, this works well, but printers that are known (by the humans, anyway) to support PostScript are not showing up. I would like to know what criteria lookupPrintServices uses to decide that a printer supports PostScript, so that I can provide a more satisfying answer to our QA department - and eventually to our customers - than the printer must be installed so as to support PostScript.
I need an answer mostly for Windows, but I am also having similar troubles on Linux. In the latter case, I have a system with three printers configured - all PostScript - and the all showed up when I began developing this part of our application. Suddenly, two of them stopped showing up, and their supportDocFlavors is now returning null!
Any pointers will be greatly appreciated.

Reza_mp wrote:
java.lang.UnsatisfiedLinkError: C:\Program Files\Java\jdk1.6.0\bin\jri.dll: Can't find dependent librariesThe error tells you the problem.
The jri library was successfully found.
That library requires other dlls. Those dlls were not found. So you are missing some dlls.

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