Bug 25955 [Workbench] Exiting while saving can cause problems
This seems to be a problem with either the workbench in general or the editor structure in particular. I have reproduced this with the Java editor but there is no reason why it wouldn't occur with other editors as well. Dirty a Java editor. Press Ctrl+S to save the editor. While it is saving, quickly close the main perspective window, either by clicking the X or by choosing File->Save. When prompted to save dirty resources say Okay. An error dialog appears stating that the save failed, and a stack trace is printed to the log (sorry, I don't have my log anymore, but it's fairly easy to reproduce). The dialog says: "Problems occurred while trying to save the state of the workbench." Details: "Save cannot be called from inside an operation." I guess the real problem is that I'm able to exit while a workspace operation is taking place. Reproduced on both Win2K and Linux.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/window/ApplicationWindow.java
manager = null;
	}
	boolean menuBarWasEnabled = false;
	if (menuBar != null)
		menuBarWasEnabled = menuBar.isEnabled();
	Control toolbarControl = getToolBarControl();
	boolean toolbarWasEnabled = false;
	if (toolbarControl != null) 
		toolbarWasEnabled = toolbarControl.isEnabled();
	
	Shell[] shells = display.getShells();
	boolean[] enabled = new boolean[shells.length];
	for (int i = 0; i < shells.length; i++) {
		Shell current = shells[i];
		if (current == shell) continue;
		if (current != null && !current.isDisposed()) {
			enabled[i] = current.isEnabled();
			current.setEnabled(false);
		}
	}
	Control currentFocus = display.getFocusControl();
	try {
		contents.setEnabled(false);
		if (menuBar != null) menuBar.setEnabled(false);
		if (toolbarControl != null) toolbarControl.setEnabled(false);
		mgr.setCancelEnabled(cancelable);
		final Exception[] holder = new Exception[1];
		BusyIndicator.showWhile(display, new Runnable() {
			public void run() {
				try {