Bug 329918 NPE thrown when activating a part after resetting a perspective without an editor area and the last active part was in the area
1. Open a perspective without an editor area. 2. Open a file. 3. The editor is now active. 4. Window > Reset Perspective... > OK 5. Try to activate a view. An NPE is thrown. Caused by: java.lang.NullPointerException at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.setCSSInfo(SWTPartRenderer.java:68) at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.trackActivePart(WBWRenderer.java:131) at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:618) at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:52) ... 53 more
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/ElementReferenceRenderer.java
private static Map<MUIElement, List<MPlaceholder>> renderedMap = new HashMap<MUIElement, List<MPlaceholder>>();
	/**
	 * Get the list of all place holders that reference the given element
	 * 
	 * @param element
	 *            The element to get place holders for