Bug 69240 [reconciling] Editor shows "stale" compilation error
Eclipse has always has a small problem in that occaisionally it would show an error in the editor window (red-squiggly, with a marker) even though the error had been fixed and no longer appeared in the Tasks/Problem view. I usually just type "Space-Backspace" and save the file and it goes away. In 3.0, this is MUCH more frequent. I'm not 100% sure of the cause, but every time I've seen in it recently, file A will have a problem, and then I'll change file B to fix it. I'll pay more attention, and see if I can obtain any more details.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/JavaReconciler.java
private volatile boolean fHasJavaModelChanged= true;
	/**
	 * The resource change listener.
	 * @since 3.0
	 */
	private IResourceChangeListener fResourceChangeListener;
	private boolean fIninitalProcessDone= false;
	
	/**
	 * Creates a new reconciler.
	 */
	public JavaReconciler(ITextEditor editor, JavaCompositeReconcilingStrategy strategy, boolean isIncremental) {
		super(strategy, isIncremental);
		fTextEditor= editor;
		
		
		
		
		 
		
		
		
		
		
		 
		if (editor instanceof CompilationUnitEditor)
			fMutex= ((CompilationUnitEditor) editor).getReconcilerLock();
		else
			fMutex= new Object(); 
	}