java.lang.NullPointerException at org.netbeans.modules.db.explorer.node.ColumnNode$2.run(ColumnNode.java:236) at org.netbeans.modules.db.explorer.node.ColumnNode$2.run(ColumnNode.java:233) at org.netbeans.modules.db.metadata.model.JDBCConnMetadataModel.runReadAction(JDBCConnMetadataModel.java:94) at org.netbeans.modules.db.metadata.model.api.MetadataModel.runReadAction(MetadataModel.java:89) at org.netbeans.modules.db.explorer.node.ColumnNode.getPosition(ColumnNode.java:232) at org.netbeans.modules.db.explorer.node.ColumnNodeProvider$ColumnComparator.compare(ColumnNodeProvider.java:146) at org.netbeans.modules.db.explorer.node.ColumnNodeProvider$ColumnComparator.compare(ColumnNodeProvider.java:140) at java.util.TreeMap.put(TreeMap.java:530) at java.util.TreeSet.add(TreeSet.java:238) at java.util.AbstractCollection.addAll(AbstractCollection.java:305) at java.util.TreeSet.addAll(TreeSet.java:295) at org.netbeans.api.db.explorer.node.NodeProvider.setNodes(NodeProvider.java:183) at org.netbeans.modules.db.explorer.node.ColumnNodeProvider.initialize(ColumnNodeProvider.java:137) at org.netbeans.api.db.explorer.node.NodeProvider.getNodes(NodeProvider.java:103) at org.netbeans.modules.db.explorer.node.NodeRegistry.getNodes(NodeRegistry.java:149) at org.netbeans.api.db.explorer.node.ChildNodeFactory.createKeys(ChildNodeFactory.java:104) at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:164) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:655) at org.openide.nodes.AsynchChildren.refresh(AsynchChildren.java:119) at org.openide.nodes.ChildFactory.refresh(ChildFactory.java:159) at org.netbeans.api.db.explorer.node.ChildNodeFactory.refresh(ChildNodeFactory.java:74) at org.netbeans.api.db.explorer.node.BaseNode.update(BaseNode.java:251) at org.netbeans.api.db.explorer.node.BaseNode.refresh(BaseNode.java:178) at org.netbeans.api.db.explorer.node.NodeProvider.refresh(NodeProvider.java:133) at org.netbeans.modules.db.explorer.node.NodeRegistry.refresh(NodeRegistry.java:136) at org.netbeans.api.db.explorer.node.BaseNode.refresh(BaseNode.java:177) at org.netbeans.modules.db.explorer.action.RefreshAction$1.run(RefreshAction.java:103) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)