Bug 34754 Array out of bounds in code assist
Build: 2.1 RC2 I got into a state when invoking code assist where the popup window was empty. I can't reproduce it, but I was typing while the popup was open. When I entered a character that narrowed down the possible search values to zero, I was left with an empty popup window. In my case I had entered resource.getK (and there are no methods starting with "getk" on IResource). This resulted in an ArrayIndexOutOfBoundsException in the log. I will attach the log.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/JavaCompletionProposal.java
int offset= widgetCaret;
		int length= fReplacementOffset + fReplacementLength - modelCaret;
	
		Color foreground= getForegroundColor(text);
		Color background= getBackgroundColor(text);
		repairPresentation(viewer);
		fRememberedStyleRange= new StyleRange(offset, length, foreground, background);
		text.setStyleRange(fRememberedStyleRange);
	}
	/*
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#selected(ITextViewer, boolean)
	 */
	public void selected(ITextViewer viewer, boolean smartToggle) {
		if (!insertCompletion() ^ smartToggle)
			updateStyle(viewer);
		else {
			repairPresentation(viewer);
			fRememberedStyleRange= null;
		}
	}
	/*
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension2#unselected(ITextViewer)
	 */
	public void unselected(ITextViewer viewer) {
		repairPresentation(viewer);
		fRememberedStyleRange= null;
	}
}