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Thread: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException I CANT FIND THE MISTAKE

  1. #1
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    Default Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException I CANT FIND THE MISTAKE

    i am doing an insert program and it involve the exception handling
    when it catch the error a message dialog will be popped up and when i click ok i am getting following error
    and what is the problem?

    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at AddNewStock$SaveAction.actionPerformed(AddNewStock .java:200)
    at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.jav a:6504)
    at javax.swing.JComponent.processMouseEvent(JComponen t.java:3321)
    at java.awt.Component.processEvent(Component.java:626 9)
    at java.awt.Container.processEvent(Container.java:222 9)
    at java.awt.Component.dispatchEventImpl(Component.jav a:4860)
    at java.awt.Container.dispatchEventImpl(Container.jav a:2287)
    at java.awt.Component.dispatchEvent(Component.java:46 86)
    at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.jav a:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2713 )
    at java.awt.Component.dispatchEvent(Component.java:46 86)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.j ava:707)
    at java.awt.EventQueue.access$000(EventQueue.java:101 )
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:680)
    at java.awt.EventQueue$4.run(EventQueue.java:678)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java: 677)
    at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:90)


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException I CANT FIND THE MISTAKE

    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at AddNewStock$SaveAction.actionPerformed(AddNewStock .java:200)
    There is a variable on line 200 that has a null value when the line is executed. Look at that line and find the variable with the null value and then backtrack in the code to see why that variable does not have a valid non-null value.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Super Moderator curmudgeon's Avatar
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    Default Re: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException I CANT FIND THE MISTAKE

    The problem is that you're trying to use a null variable at the line indicated by the error message above:
    AddNewStock .java:200

    i.e., line 200 of the AddNewStock class.

    Since you have the code and we don't, you'll have to check that line to see which variable is null on it, and then trace back in your code to see why.

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