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I had more web applications deployed on Glassfish. Then I choosed in the Runtime tab -> Sun Java System Application Server -> Applications -> Web Applications three of them and invoke action Undeploy. I got this exception: java.lang.NullPointerException at org.netbeans.modules.j2ee.sun.ide.runtime.actions.UndeployAction$1.run(UndeployAction.java:57) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:493) [catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:926)
Fixed NPE caused by refresh action after undeploying multiple deployed modules
*** Issue 74447 has been marked as a duplicate of this issue. ***