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Start NetBeans with a java file open. Immediately choose Tools | Import Management Tool. (do it immediately after start so class resolving will be slow to see the bug) Wizard opens. Click Next. A dialog pops up: Wizard panel org.netbeans.modules.java.imptool.RootPanel$WizPanel@662b4e gave a strange component. [OK] 2 things: 1. Use a container component and add your panel to it when resolving is complete, so the component is non-null 2. This exception should not be annotated ErrorManager.USER - there is no meaningful information for the user in the message (that part is probably a fix needed in the wizards framework)
*** This issue has been marked as a duplicate of 33199 ***