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This bug was originally marked as duplicate of bug 159079, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 201109040600) VM: Java HotSpot(TM) Client VM, 21.0-b17, Java(TM) SE Runtime Environment, 1.7.0-b147 OS: Windows XP User Comments: asenk: I made a lot of steps before this exception. Posible steps to reproduce: Create new J2SE project and crete new JFrame Form --Drag a Radio Button from pallete to JFrame Form claus_ch: I have a simple maven-based test project having a JFrame and a TextArea (everything default). The crash happened, while draging a ComboBox onto a blank spot of the JPanel in Mantisse. Stacktrace: java.lang.AssertionError at org.netbeans.modules.form.layoutdesign.LayoutDesigner.endMoving(LayoutDesigner.java:756) at org.netbeans.modules.form.HandleLayer$NewComponentDrag.end(HandleLayer.java:3141) at org.netbeans.modules.form.HandleLayer$NewComponentDropListener.drop(HandleLayer.java:3338) at java.awt.dnd.DropTarget.drop(DropTarget.java:450) at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:537) at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:851)
Created attachment 110384 [details] stacktrace
*** This bug has been marked as a duplicate of bug 159079 ***