Description Samantha Chan 2011-08-05 15:33:01 EDT

In this code here:

	textInputListener = new ITextInputListener() {
			public void inputDocumentChanged(IDocument oldInput, IDocument newInput) {
				try {
					xtextDocument.removeModelListener(modelListener);
					xtextDocument = XtextDocumentUtil.get(newInput);
					xtextDocument.addModelListener(modelListener);
					scheduleRefresh();
				} catch (Throwable t) {
					LOG.error("Error refreshing outline", t);
				}
			}
			
			public void inputDocumentAboutToBeChanged(IDocument oldInput, IDocument newInput) {
			}
		};

XTextDocumentUtil.get(newInput) can return null as the xtextDocument.  We use the XtextDocument object without checking the return value, causing NPE to happen.