Error creating GUI for dmardemo.java

Question

Hi friends!
I took the demo dmardemo.java (Association Rules) which comes with the ODM for Java to test Data Mining function in the sample database Sales History. In the original code, the application ran normally. However, I'm trying to create a GUI to execute the most important funcionalities like creating view, preparing and building model and restoring rules and itemsets. I created a visual class in the same project where the demo is. I've done some changes in the methods, like putting some input parameters for them. e.g.:
[i]public static void buildModel(String viewModelo, String configTask, String modelName, String taskName) throws JDMException
Connecting is ok. However I can not create the view.. When I execute this method for creating the view, some erros occurs, like:
Create build data view...
java.sql.SQLException: Closed Connection
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208)
     at oracle.jdbc.driver.PhysicalConnection.prepareStatement(PhysicalConnection.java:840)
     at oracle.jdbc.driver.PhysicalConnection.prepareStatement(PhysicalConnection.java:759)
     at project1.dmardemo.createBuildData(dmardemo.java:277)
     at project1.Principal.jMenuItem1ActionPerformed(Principal.java:181)
     at project1.Principal$7.actionPerformed(Principal.java:110)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
     at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
     at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1170)
     at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1211)
     at java.awt.Component.processMouseEvent(Component.java:6038)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3260)
     at java.awt.Component.processEvent(Component.java:5803)
     at java.awt.Container.processEvent(Container.java:2058)
     at java.awt.Component.dispatchEventImpl(Component.java:4410)
     at java.awt.Container.dispatchEventImpl(Container.java:2116)
     at java.awt.Component.dispatchEvent(Component.java:4240)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
     at java.awt.Container.dispatchEventImpl(Container.java:2102)
     at java.awt.Window.dispatchEventImpl(Window.java:2429)
     at java.awt.Component.dispatchEvent(Component.java:4240)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
What could be happening?
Thanks!!
Regards
Luis

Answer 1

I have to tell you that the problem was occurring because of the clean() method. It must clean all views created before, and I was ignoring its execution. Now, another thing is happening: every time I made a call for it, an exception occurs, telling me that I must pass an input parameter for this method, and a null value for the objectName is not allowed.
However, this method doesn't work with any parameters.
What could be happening?
Thanks a lot!
Luis