java.lang.NullPointerException
        at org.netbeans.modules.j2ee.common.project.ui.J2eePlatformNode.<init>(J2eePlatformNode.java:117)
        at org.netbeans.modules.j2ee.common.project.ui.J2eePlatformNode.create(J2eePlatformNode.java:123)
        at org.netbeans.modules.j2ee.common.project.ui.LibrariesNode$LibrariesChildren.createNodes(LibrariesNode.java:327)
        at org.netbeans.modules.j2ee.common.project.ui.LibrariesNode$LibrariesChildren.createNodes(LibrariesNode.java:220)
        at org.openide.nodes.Children$Keys$KE.nodes(Children.java:1572)
        at org.openide.nodes.ChildrenArray.nodesFor(ChildrenArray.java:168)
        at org.openide.nodes.EntrySupport$Default$Info.nodes(EntrySupport.java:926)
        at org.openide.nodes.EntrySupport$Default.updateAdd(EntrySupport.java:506)
        at org.openide.nodes.EntrySupport$Default.setEntries(EntrySupport.java:339)
        at org.openide.nodes.Children$Keys$2.run(Children.java:1466)
        at org.openide.util.Mutex.postRequest(Mutex.java:1251)
        at org.openide.util.Mutex.postWriteRequest(Mutex.java:582)
        at org.openide.nodes.Children$Keys.applyKeys(Children.java:1475)
        at org.openide.nodes.Children$Keys.setKeys(Children.java:1419)
        at org.netbeans.modules.j2ee.common.project.ui.LibrariesNode$LibrariesChildren.access$100(LibrariesNode.java:220)
        at org.netbeans.modules.j2ee.common.project.ui.LibrariesNode$LibrariesChildren$1.run(LibrariesNode.java:287)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)