org.netbeans.api.db.explorer.DatabaseException: Operation not allowed after ResultSet closed
        at org.netbeans.modules.db.explorer.infos.TableNodeInfo.initChildren(TableNodeInfo.java:167)
        at org.netbeans.modules.db.explorer.infos.TableNodeInfo.initChildren(TableNodeInfo.java:78)
        at org.netbeans.modules.db.explorer.infos.DatabaseNodeInfo.getChildren(DatabaseNodeInfo.java:688)
        at org.netbeans.modules.db.explorer.nodes.DatabaseNode$DatabaseNodeChildFactory.createKeys(DatabaseNode.java:382)
        at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:142)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)
java.sql.SQLException: Operation not allowed after ResultSet closed
        at com.mysql.jdbc.ResultSet.checkClosed(ResultSet.java:639)
        at com.mysql.jdbc.ResultSet.checkRowPos(ResultSet.java:677)
        at com.mysql.jdbc.ResultSet.getStringInternal(ResultSet.java:5021)
        at com.mysql.jdbc.ResultSet.getString(ResultSet.java:4999)
        at org.netbeans.lib.ddl.impl.DriverSpecification.getRow(DriverSpecification.java:230)
        at org.netbeans.modules.db.explorer.infos.TableNodeInfo.initChildren(TableNodeInfo.java:141)
        at org.netbeans.modules.db.explorer.infos.TableNodeInfo.initChildren(TableNodeInfo.java:78)
        at org.netbeans.modules.db.explorer.infos.DatabaseNodeInfo.getChildren(DatabaseNodeInfo.java:688)
        at org.netbeans.modules.db.explorer.nodes.DatabaseNode$DatabaseNodeChildFactory.createKeys(DatabaseNode.java:382)
        at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:142)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)