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This bug was originally marked as duplicate of bug 124004, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 6.9.1 (Build 201007282301) VM: Java HotSpot(TM) Client VM, 11.3-b02, Java(TM) SE Runtime Environment, 1.6.0_13-b03 OS: Windows XP User Comments: FiruzzZ: opening a javax.swing.JFrame (design mode) GUEST: Compiling i guess. GUEST: I was coding a class that uses CachedRowSetImpl Stacktrace: java.lang.NullPointerException at org.netbeans.modules.form.FormDesigner.isInDesigner(FormDesigner.java:542) at org.netbeans.modules.form.FormDesigner.componentToLayoutComponent(FormDesigner.java:1024) at org.netbeans.modules.form.FormDesigner.addComponentToSelectionImpl(FormDesigner.java:1004) at org.netbeans.modules.form.ComponentInspector$NodeSelectionListener.propertyChange(ComponentInspector.java:528) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
Created attachment 102366 [details] stacktrace
*** This bug has been marked as a duplicate of bug 189837 ***