Table Model:: Null Pointer Exception

I have made an application wherein I am using a JTree to display some hierarchy.
Now while scrolling the tree,I display the details in the table.
Data for both the components come from the database.If I continously scroll up and down for some time
in the Tree I get an error in the Table Model
rsmd=rs.getMetaData();
for the above line.It throws NullPointerException,it only happens after scrolling for some time and
not for any particular value.
I update the table model using jtable.setModel().
Plz help.

What is actually throwing the NullPointerException? rs.getMetaData() or table.setModel()?

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    What are we doing wrong?`
    Can somebody help me please?

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         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
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         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
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         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
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         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at oracle.adf.view.rich.render.RichRenderer.encodeStretchedChild(RichRenderer.java:2194)
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         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
         at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
         at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
         at oracle.adfinternal.view.faces.renderkit.rich.PageTemplateRenderer.encodeAll(PageTemplateRenderer.java:68)
         at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
         at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
         at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
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        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
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    Can someone tell me why this error occurs.My method is like this -
    public void onSelect(ValueChangeEvent event) {
    event.getComponent().processUpdates(FacesContext.getCurrentInstance());
    String[] s = (String[])event.getNewValue();
    System.out.println("Value changed value change ==>> "+s.length+"===>>"+Arrays.toString(s));

    Do you get the same results if you try queuing the event to happen after the model update?
    // Requeue the event so that it happens after the model update
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    valueChangeEvent.setPhaseId(PhaseId.INVOKE_APPLICATION);
    valueChangeEvent.queue();
        } else {     
         String[] s = (String[])event.getNewValue();
        System.out.println("Value changed value change ==>> "+s.length+"===>>"+Arrays.toString(s));

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