The following exception may be encountered if the OpenGL pipeline is enabled
and the default visual is not GLX-enabled:

Exception in thread "main" java.lang.ClassCastException:
sun.awt.X11GraphicsConfig
        at sun.java2d.opengl.GLXSurfaceData.getGC(GLXSurfaceData.java:90)
        at sun.java2d.opengl.GLXSurfaceData.createData(GLXSurfaceData.java:59)

        at
sun.java2d.opengl.GLXVolatileSurfaceManager.initAcceleratedSurface(GLXVolatileSurfaceManager.java:57)

        at
sun.awt.image.VolatileSurfaceManager.initialize(VolatileSurfaceManager.java:93)

        at sun.awt.image.SunVolatileImage.<init>(SunVolatileImage.java:60)
        at sun.awt.image.SunVolatileImage.<init>(SunVolatileImage.java:46)
        at sun.awt.image.SunVolatileImage.<init>(SunVolatileImage.java:72)
        at
sun.java2d.opengl.GLXGraphicsConfig.createBackBufferImage(GLXGraphicsConfig.java:221)

        at sun.awt.X11.XComponentPeer.createBuffers(XComponentPeer.java:1197)
        at
java.awt.Component$FlipBufferStrategy.createBuffers(Component.java:3318)
        at java.awt.Component$FlipBufferStrategy.<init>(Component.java:3287)
        at java.awt.Component.createBufferStrategy(Component.java:3196)
        at java.awt.Window.createBufferStrategy(Window.java:2081)
        at java.awt.Component.createBufferStrategy(Component.java:3128)
        at java.awt.Window.createBufferStrategy(Window.java:2056)
        at XformMB.<init>(XformMB.java:53)
        at XformMB.main(XformMB.java:163)