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java.lang.NullPointerException: 	at javax.swing.JTable.prepareRenderer(JTable.java:3928)	at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2072)	at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:1974)	at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1897)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)	at javax.swing.JComponent.paintComponent(JComponent.java:743)	at javax.swing.JComponent.paint(JComponent.java:1006)	at javax.swing.JComponent.paintChildren(JComponent.java:843)	at javax.swing.JComponent.paint(JComponent.java:1015)	at javax.swing.JViewport.paint(JViewport.java:728)	at javax.swing.JComponent.paintChildren(JComponent.java:843)	at javax.swing.JComponent.paint(JComponent.java:1015)	at javax.swing.JComponent.paintChildren(JComponent.java:843)	at javax.swing.JComponent.paint(JComponent.java:1015)	at javax.swing.JComponent.paintChildren(JComponent.java:843)	at javax.swing.JComponent.paint(JComponent.java:1015)	at javax.swing.JLayeredPane.paint(JLayeredPane.java:559)	at javax.swing.JComponent.paintChildren(JComponent.java:843)	at javax.swing.JComponent.paint(JComponent.java:1015)	at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)	at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)	at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)	at java.awt.Container.paint(Container.java:1709)	at sun.awt.RepaintArea.paintComponent(RepaintArea.java:248)	at sun.awt.RepaintArea.paint(RepaintArea.java:224)	at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:254)	at java.awt.Component.dispatchEventImpl(Component.java:4044)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Window.dispatchEventImpl(Window.java:1778)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)	at java.awt.Dialog$1.run(Dialog.java:525)	at java.awt.Dialog$2.run(Dialog.java:553)	at java.security.AccessController.doPrivileged(Native Method)	at java.awt.Dialog.show(Dialog.java:551)	at java.awt.Component.show(Component.java:1300)	at java.awt.Component.setVisible(Component.java:1253)	at org.pentaho.reporting.libraries.designtime.swing.background.DataPreviewDialog.showData(DataPreviewDialog.java:135)	at org.pentaho.reporting.ui.datasources.jdbc.ui.JdbcDataSourceDialog$PreviewAction.actionPerformed(JdbcDataSourceDialog.java:129)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)	at java.awt.Component.processMouseEvent(Component.java:5501)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)	at java.awt.Component.processEvent(Component.java:5266)	at java.awt.Container.processEvent(Container.java:1966)	at java.awt.Component.dispatchEventImpl(Component.java:3968)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)	at java.awt.Container.dispatchEventImpl(Container.java:2010)	at java.awt.Window.dispatchEventImpl(Window.java:1778)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)	at java.awt.Dialog$1.run(Dialog.java:525)	at java.awt.Dialog$2.run(Dialog.java:553)	at java.security.AccessController.doPrivileged(Native Method)	at java.awt.Dialog.show(Dialog.java:551)	at java.awt.Component.show(Component.java:1300)	at java.awt.Component.setVisible(Component.java:1253)	at org.pentaho.reporting.ui.datasources.jdbc.ui.JdbcDataSourceDialog.performConfiguration(JdbcDataSourceDialog.java:624)	at org.pentaho.reporting.ui.datasources.jdbc.JdbcDataSourcePlugin.performEdit(JdbcDataSourcePlugin.java:67)	at org.pentaho.reporting.designer.core.actions.report.EditQueryAction.performEdit(EditQueryAction.java:147)	at org.pentaho.reporting.designer.core.editor.structuretree.StructureTreePanel$ReportTreeContextMenuHandler.mouseClicked(StructureTreePanel.java:140)	at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:212)	at java.awt.Component.processMouseEvent(Component.java:5504)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)	at java.awt.Component.processEvent(Component.java:5266)	at java.awt.Container.processEvent(Container.java:1966)	at java.awt.Component.dispatchEventImpl(Component.java:3968)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3901)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)	at java.awt.Container.dispatchEventImpl(Container.java:2010)	at java.awt.Window.dispatchEventImpl(Window.java:1778)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)