When i click node of tree this exception occured.. what is problem plz ...

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(Unknown Source)
at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(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)

ok, I'll bite:
Obviously, something in your code is null when it isn't supposed to be. My suggestion is to run your code in a debugger to find the source of the null value.
good luck

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Hi,
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Sandhya S wrote:
I am facing a problem while deploying an Entity bean in iPlanet(sp3).I
have attached the exception thrown.Why has this exception occured?
[04/Dec/2001 10:54:00:2] error: EBFP-marshal_internal: internal
exception caught in kcp skeleton, ex
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at
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Source)
at
com.netscape.server.ejb.EntityDelegateManagerImpl.getPersistenceManager(Unknown
Source)
at
com.netscape.server.ejb.EntityDelegateManagerImpl.doPersistentFind(Unknown
Source)
at
com.netscape.server.ejb.EntityDelegateManagerImpl.find(Unknown Source)
at com.kivasoft.eb.EBHomeBase.findSingleByParms(Unknown
Source)
at
samples.test.ejb.Entity.ejb_home_samples_test_ejb_Entity_TestEntityBean.findByPrimaryKey(
ejb_home_samples_test_ejb_Entity_TestEntityBean.java:126)
at
samples.test.ejb.Entity.ejb_kcp_skel_TestEntityHome.findByPrimaryKey__samples_test_ejb_En
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at
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java:85)
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When i click node of tree this exception occured.. what is problem plz ...

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