Using the recent versions of the Processing libs with Eclipse produces an
error. At the moment, I've got the project's build path using core.jar,
jogl.jar and opengl.jar from the 0147 release, but i've got the
opengl.jar's native lib location pointed at the opengl library folder from
0135 and this works, but if i point it to the native lib location in the
actual 0147 release this error happens:

Error while running applet.
java.lang.RuntimeException: java.lang.ClassCastException:
java.nio.DirectByteBuffer
at processing.opengl.PGraphicsOpenGL.requestDisplay(PGraphicsOpenGL.java:172)
at processing.core.PApplet.run(PApplet.java:1562)
at java.lang.Thread.run(Thread.java:613)
Caused by: java.lang.ClassCastException: java.nio.DirectByteBuffer
java.lang.RuntimeException: java.lang.ClassCastException:
java.nio.DirectByteBuffer
at processing.opengl.PGraphicsOpenGL.requestDisplay(PGraphicsOpenGL.java:172)
at processing.core.PApplet.run(PApplet.java:1562)
at java.lang.Thread.run(Thread.java:613)
Caused by: java.lang.ClassCastException: java.nio.DirectByteBuffer
at
com.sun.opengl.impl.macosx.MacOSXOnscreenGLDrawable.lockSurface(MacOSXOnscreenGLDrawable.java:177)
at
com.sun.opengl.impl.macosx.MacOSXOnscreenGLContext.makeCurrentImpl(MacOSXOnscreenGLContext.java:57)
at com.sun.opengl.impl.GLContextImpl.makeCurrent(GLContextImpl.java:127)
at com.sun.opengl.impl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:182)
at
javax.media.opengl.GLCanvas$DisplayOnEventDispatchThreadAction.run(GLCanvas.java:298)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
at
com.sun.opengl.impl.macosx.MacOSXOnscreenGLDrawable.lockSurface(MacOSXOnscreenGLDrawable.java:177)
at
com.sun.opengl.impl.macosx.MacOSXOnscreenGLContext.makeCurrentImpl(MacOSXOnscreenGLContext.java:57)
at com.sun.opengl.impl.GLContextImpl.makeCurrent(GLContextImpl.java:127)
at com.sun.opengl.impl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:182)
at
javax.media.opengl.GLCanvas$DisplayOnEventDispatchThreadAction.run(GLCanvas.java:298)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "AWT-EventQueue-0" javax.media.opengl.GLException:
Attempt to make the same context current twice on thread
Thread[AWT-EventQueue-0,6,main]
at com.sun.opengl.impl.GLContextLock.lock(GLContextLock.java:83)
at com.sun.opengl.impl.GLContextImpl.makeCurrent(GLContextImpl.java:124)
at com.sun.opengl.impl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:182)
at
javax.media.opengl.GLCanvas.maybeDoSingleThreadedWorkaround(GLCanvas.java:258)
at javax.media.opengl.GLCanvas.display(GLCanvas.java:130)
at javax.media.opengl.GLCanvas.paint(GLCanvas.java:142)
at sun.awt.RepaintArea.paintComponent(RepaintArea.java:276)
at sun.awt.RepaintArea.paint(RepaintArea.java:241)
at apple.awt.ComponentModel.handleEvent(ComponentModel.java:268)
at java.awt.Component.dispatchEventImpl(Component.java:4144)
at java.awt.Component.dispatchEvent(Component.java:3903)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

You're mixing up different versions of core.jar, opengl.jar, jogl.jar, etc.
That's not a Processing bug, your Eclipse project is in a bad state.