output from http://www.codecommit.com/blog/java/rapid-prototyping-with-jruby

gistfile1.txt

Exception in thread "AWT-EventQueue-0" sun/java2d/d3d/D3DRenderer.java:29:in `validateContext': java.lang.NullPointerException: null (NativeException)
        from sun/java2d/pipe/BufferedRenderPipe.java:109:in `fillRect'
        from sun/java2d/pipe/ValidatePipe.java:58:in `fillRect'
        from sun/java2d/SunGraphics2D.java:2265:in `fillRect'
        from sun/reflect/NativeMethodAccessorImpl.java:-2:in `invoke0'
        from sun/reflect/NativeMethodAccessorImpl.java:39:in `invoke'
        from sun/reflect/DelegatingMethodAccessorImpl.java:25:in `invoke'
Exception in thread "AWT-EventQueue-0"  from java/lang/reflect/Method.java:597:in `invoke'
        from org/jruby/javasupport/JavaMethod.java:491:in `invokeDirectWithExceptionHandling'
        from :1:in `paintComponent'
        from :1
        ...internal jruby stack elided...
        from sun.java2d.pipe.BufferedRenderPipe.fillRect(BufferedRenderPipe.java:109)
        from sun.java2d.pipe.ValidatePipe.fillRect(ValidatePipe.java:58)
        from sun.java2d.SunGraphics2D.fillRect(SunGraphics2D.java:2265)
        from sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        from sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        from sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        from java.lang.reflect.Method.invoke(Method.java:597)
        from org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(JavaMethod.java:491)
sun/java2d/d3d/D3DRenderer.java:29:in `validateContext': java.lang.NullPointerException: null (NativeException)
        from sun/java2d/pipe/BufferedRenderPipe.java:109:in `fillRect'
        from sun/java2d/pipe/ValidatePipe.java:58:in `fillRect'
        from sun/java2d/SunGraphics2D.java:2265:in `fillRect'
        from sun/reflect/NativeMethodAccessorImpl.java:-2:in `invoke0'
        from sun/reflect/NativeMethodAccessorImpl.java:39:in `invoke'
        from sun/reflect/DelegatingMethodAccessorImpl.java:25:in `invoke'
        from java/lang/reflect/Method.java:597:in `invoke'
        from org/jruby/javasupport/JavaMethod.java:491:in `invokeDirectWithExceptionHandling'
        from :1:in `paintComponent'
        from :1
        ...internal jruby stack elided...
        from sun.java2d.pipe.BufferedRenderPipe.fillRect(BufferedRenderPipe.java:109)
        from sun.java2d.pipe.ValidatePipe.fillRect(ValidatePipe.java:58)
        from sun.java2d.SunGraphics2D.fillRect(SunGraphics2D.java:2265)
        from sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        from sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        from sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        from java.lang.reflect.Method.invoke(Method.java:597)
        from org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(JavaMethod.java:491)