How to use palette window decorators in Java/Swing?

is there an op开发者_JS百科en solution to use palette window decorators in Java/Swing like in the following screenshot? JNIWrapper can do this but it is neither open nor free.

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Have you looked at JNA library? Should be enough if you just have to call Windows API.

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Here is the slolution:

User32.INSTANCE.SetWindowLong(new HWND(Native.getWindowPointer(frame)), -20, new Pointer(0x00000080L));

User32 is part of the JNA platform.jar. But most probably it only runs with a 32bit JVM. With 64bit you have to call SetWindowLongPtr but this doesn't seem to be mapped in JNA (UnsatisfiedLinkError).