java.lang.NullPointerException
   at com.mysql.jdbc.ConnectionImpl.registerStatement(ConnectionImpl.java:4450)
   at com.mysql.jdbc.StatementImpl.<init>(StatementImpl.java:336)
   at com.mysql.jdbc.ConnectionImpl.createStatement(ConnectionImpl.java:2485)
   at com.mysql.jdbc.ConnectionImpl.createStatement(ConnectionImpl.java:2465)
   at com.mysql.jdbc.ConnectionImpl.getMetadataSafeStatement(ConnectionImpl.java:3068)
   at com.mysql.jdbc.DatabaseMetaData.getColumns(DatabaseMetaData.java:2372)
   at org.netbeans.modules.db.metadata.model.jdbc.JDBCTable.createColumns(JDBCTable.java:175)
   at org.netbeans.modules.db.metadata.model.jdbc.JDBCTable.initColumns(JDBCTable.java:408)
   at org.netbeans.modules.db.metadata.model.jdbc.JDBCTable.getColumns(JDBCTable.java:96)
   at org.netbeans.modules.db.metadata.model.api.Table.getColumns(Table.java:80)
   at org.netbeans.modules.db.explorer.node.ColumnNodeProvider$1.run(ColumnNodeProvider.java:109)
   at org.netbeans.modules.db.explorer.node.ColumnNodeProvider$1.run(ColumnNodeProvider.java:101)
   at org.netbeans.modules.db.metadata.model.JDBCConnMetadataModel.runReadAction(JDBCConnMetadataModel.java:97)
   at org.netbeans.modules.db.metadata.model.api.MetadataModel.runReadAction(MetadataModel.java:92)
   at org.netbeans.modules.db.explorer.node.ColumnNodeProvider.initialize(ColumnNodeProvider.java:100)
   at org.netbeans.api.db.explorer.node.NodeProvider.getNodes(NodeProvider.java:107)
   at org.netbeans.modules.db.explorer.node.NodeRegistry.getNodes(NodeRegistry.java:167)
   at org.netbeans.api.db.explorer.node.ChildNodeFactory.createKeys(ChildNodeFactory.java:107)
   at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:206)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1452)
   at org.openide.nodes.AsynchChildren.refresh(AsynchChildren.java:133)
   at org.openide.nodes.ChildFactory.refresh(ChildFactory.java:167)
   at org.netbeans.api.db.explorer.node.ChildNodeFactory.refresh(ChildNodeFactory.java:77)
   at org.netbeans.api.db.explorer.node.BaseNode.update(BaseNode.java:258)
   at org.netbeans.api.db.explorer.node.BaseNode.refresh(BaseNode.java:185)
   at org.netbeans.api.db.explorer.node.NodeProvider.refresh(NodeProvider.java:138)
   at org.netbeans.modules.db.explorer.node.NodeRegistry.refresh(NodeRegistry.java:147)
   at org.netbeans.api.db.explorer.node.BaseNode.refresh(BaseNode.java:184)
   at org.netbeans.modules.db.explorer.action.RefreshAction$1.run(RefreshAction.java:110)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1411)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1991)