java.lang.NullPointerException: This exception has no message.

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via hsqldb by nobody
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via hsqldb by woodrowcw
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java.lang.NullPointerException: 	at org.hsqldb.jdbcResultSet.getColumnType(Unknown Source)	at com.jdc.db.SchemaDump.execute(SchemaDump.java:255)	at com.jdc.db.SchemaDump.run(SchemaDump.java:413)	at java.lang.Thread.run(Thread.java:536)	at com.jdc.db.wizards.exportdb.ExportDBWizardController.finish(ExportDBWizardController.java:60)	at com.jdc.components.wizard.WizardDialog.closeDialog(WizardDialog.java:380)	at com.jdc.components.wizard.WizardDialog.finishButtonActionPerformed(WizardDialog.java:363)	at com.jdc.components.wizard.WizardDialog.access$400(WizardDialog.java:22)	at com.jdc.components.wizard.WizardDialog$5.actionPerformed(WizardDialog.java:307)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1764)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1817)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)	at java.awt.Component.processMouseEvent(Component.java:5134)	at java.awt.Component.processEvent(Component.java:4931)	at java.awt.Container.processEvent(Container.java:1566)	at java.awt.Component.dispatchEventImpl(Component.java:3639)	at java.awt.Container.dispatchEventImpl(Container.java:1623)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3165)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)	at java.awt.Container.dispatchEventImpl(Container.java:1609)	at java.awt.Window.dispatchEventImpl(Window.java:1590)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)