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
if (currentFocus != null) currentFocus.setFocus();
	}
}
/**
 * Sets or clears the message displayed in this window's status
 * line (if it has one). This method has no effect if the
 * window does not have a status line.
 *
 * @param message the status message, or <code>null</code> to clear it
 */
public void setStatus(String message) {
	if (statusLineManager != null) {
		statusLineManager.setMessage(message);
	}
}
/**
 * Returns whether or not children exist for the Application Window's
 * toolbar control.
 * <p>
 * @return boolean true if children exist, false otherwise
 */
protected boolean toolBarChildrenExist() {
	Control toolControl = getToolBarControl();
	if (toolControl instanceof ToolBar) {
		return ((ToolBar)toolControl).getItemCount() > 0;
	}
	return false;
}
}