Product Version = NetBeans IDE Dev (Build 201402010001)
Operating System = Windows 7 version 6.1 running on amd64
Java; VM; Vendor = 1.8.0
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.0-b69

I had an initializer block in an anonymous inner class implementing a MouseEvent handler:

	private void instalEventListener(final SplitPane splitPane) {
		splitPane.addEventFilter(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() {
			Timeline timeline;
			private double [] lastPos;
			private double [] hidePos;
			{
				int divs = splitPane.getDividers().size();
				lastPos = new double[divs];
				hidePos = new double[divs];
				hidePos[0] = 0;
				for (int i = 1; i < hidePos.length; i++) {
					hidePos[i] = 1;
				}
			}
			
			@Override
			public void handle(MouseEvent t) {
...

(EventHandler, MouseEvent, SplitPane and Timeline classes are from JavaFX)

The line below "private double [] hidePos;" was marked with the hint "Initializer can be static".  But it can't be static.  The initializer refers to instance member variables, e.g. "lastPos", "hidePos".  Invoking the hint places the "static" keyword in front of the opening { of the initializer and subsequently the code within is highlighted with error markers indicating "non-static variable lastPos cannot be referenced from a static context", etc.