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.

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

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).