newlisp button demo on OpenJDK

[jopython]

Is there an issue with running the button demo on OpenJDK on 64 bit Ubuntu (14.04)?

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:( ]$ java -version
java version "1.7.0_55"
OpenJDK Runtime Environment (IcedTea 2.4.7) (7u55-2.4.7-1ubuntu1)
OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)

:( ]$ newlisp /usr/share/newlisp/guiserver/button-demo.lsp

newLISP-GS v.1.63 on Linux
Exception in thread "main" java.awt.HeadlessException
at sun.java2d.HeadlessGraphicsEnvironment.getDefaultScreenDevice(HeadlessGraphicsEnvironment.java:77)
at guiserver.<init>(guiserver.java:207)
at guiserver.main(guiserver.java:78)
^CERR: received SIGINT - in function sleep
called from user defined function gs:init



[jopython]

Never mind. My fault. My Ubuntu only had headless java.