java.lang.NullPointerException
        at org.openide.nodes.Children$Info.useNodes(Children.java:1307)
        at org.openide.nodes.Children.refreshOrder(Children.java:1255)
        at org.openide.nodes.Children.refreshEntry(Children.java:1186)
        at org.openide.nodes.Children$Array.refreshImpl(Children.java:1440)
        at org.openide.nodes.Children$Array$1.run(Children.java:1456)
        at org.openide.util.Mutex.postRequest(Mutex.java:1251)
        at org.openide.util.Mutex.postWriteRequest(Mutex.java:582)
        at org.openide.nodes.Children$Array.refresh(Children.java:1454)
        at org.openide.nodes.Children$Array.add(Children.java:1501)
        at org.netbeans.modules.db.explorer.DatabaseNodeChildren.addSubNode(DatabaseNodeChildren.java:267)
        at org.netbeans.modules.db.explorer.DatabaseNodeChildren.createSubnode(DatabaseNodeChildren.java:281)
        at org.netbeans.modules.db.explorer.infos.RootNodeInfo.addConnectionNoConnect(RootNodeInfo.java:208)
        at org.netbeans.api.db.explorer.ConnectionManager.addConnection(ConnectionManager.java:139)
        at org.netbeans.modules.visualweb.dataconnectivity.utils.SampleDatabaseCreator.registerDatabase(SampleDatabaseCreator.java:140)
        at org.netbeans.modules.visualweb.dataconnectivity.utils.SampleDatabaseCreator.createAll(SampleDatabaseCreator.java:93)
        at org.netbeans.modules.visualweb.dataconnectivity.naming.DerbyWaiter.registerConnections(DerbyWaiter.java:112)
        at org.netbeans.modules.visualweb.dataconnectivity.naming.DerbyWaiter.access$100(DerbyWaiter.java:57)
        at org.netbeans.modules.visualweb.dataconnectivity.naming.DerbyWaiter$1.driversChanged(DerbyWaiter.java:68)
        at org.netbeans.api.db.explorer.JDBCDriverManager.fireListeners(JDBCDriverManager.java:215)
        at org.netbeans.api.db.explorer.JDBCDriverManager.access$000(JDBCDriverManager.java:61)
        at org.netbeans.api.db.explorer.JDBCDriverManager$1.resultChanged(JDBCDriverManager.java:100)
        at org.openide.util.lookup.AbstractLookup.notifyListeners(AbstractLookup.java:481)
        at org.openide.util.lookup.AbstractLookup.notifyCollectedListeners(AbstractLookup.java:358)
        at org.openide.util.lookup.AbstractLookup.setPairs(AbstractLookup.java:267)
        at org.openide.util.lookup.AbstractLookup$Content.setPairs(AbstractLookup.java:1143)
        at org.openide.loaders.FolderLookup$ProxyLkp.update(FolderLookup.java:356)
        at org.openide.loaders.FolderLookup.createInstance(FolderLookup.java:190)
        at org.openide.loaders.FolderInstance.defaultProcessObjects(FolderInstance.java:767)
        at org.openide.loaders.FolderInstance.access$000(FolderInstance.java:99)
        at org.openide.loaders.FolderInstance$2.run(FolderInstance.java:655)
        at org.openide.loaders.FolderLookup.postCreationTask(FolderLookup.java:254)
        at org.openide.loaders.FolderInstance.processObjects(FolderInstance.java:653)
        at org.openide.loaders.FolderInstance$Listener.finished(FolderInstance.java:934)
        at org.openide.loaders.FolderList.createObjects(FolderList.java:683)
        at org.openide.loaders.FolderList.getObjects(FolderList.java:546)
        at org.openide.loaders.FolderList.access$300(FolderList.java:74)
        at org.openide.loaders.FolderList$ListTask.computeResult(FolderList.java:936)
        at org.openide.loaders.FolderList$ListTask.run(FolderList.java:914)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)
INFO [org.netbeans.modules.uihandler.Installer]: findIdentity: 056e20b45-0cc8-4a85-812e-46b9c40dbb1f