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NullPoniter Exception while Adding in JComboBox

 
sonu arora
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Hi All, My application is a Applet - EJB based and Server is sending Serialized Objects to add in to the JCOMBOBOX object.

I have the following Exception coming up after a few iteratons ( 100 - 200 ) of poping up the screen again & again after closing which I am doing at a normal speed.

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List lstSeverities = (List)e.getReturnValue();
if(lstSeverities!=null){
Iterator oIterator = lstSeverities.iterator();
while (oIterator.hasNext())
{
CaseSeverity oCaseSeverity = (CaseSeverity)oIterator.next();
if(oCaseSeverity != null && oCaseSeverity.getSeverityName() != null)
m_cbxSeverity.addItem(oCaseSeverity); /* This Statement is throwing exception.*/
}
}

java.lang.NullPointerException
at javax.swing.plaf.basic.BasicComboBoxUI$ListDataHandler.contentsChanged(Unknown Source)
at javax.swing.plaf.basic.BasicComboBoxUI$ListDataHandler.intervalAdded(Unknown Source)
at javax.swing.AbstractListModel.fireIntervalAdded(Unknown Source)
at javax.swing.DefaultComboBoxModel.addElement(Unknown Source)
at javax.swing.JComboBox.addItem(Unknown Source)
at sync.client.contactmgmt.activity.CaseGeneral.handleResponse(CaseGeneral.java:1382)
at sync.client.gateway.ServerProxy.handleResponse(ServerProxy.java:96)
at sync.client.gateway.UniversalGateway$1.run(UniversalGateway.java:142)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Note - 1. This Exception is coming only once in some 200 repetitions.
2. The issue is with only this ComboBox , I have another 10 ComboBox.
3. This ComboBox is populated with sealirized objects.

Please help to identify the cause and to resolve this.

Thanks.
 
sonu arora
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Please suggest to debug this.
 
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