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The GroupAsyncRenderer can throw a NullPointerException when DisposableBeans are used. This occurs when multiple beans are using the same renderer (e.g. clock) and the first call to dispose causes the internal reference to the RenderManager to be set to null. Subsequent calls to dispose of the renderer by DisposableBeans will cause the NPE.
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I've removed the statement that sets the renderManager reference to null in GroupAsyncRenderer.dispose. There's not really a strict need to do this and subsequent dispose() calls should do the right thing. Resolving as fixed.