java.lang.NullPointerException

Coderanch | Selecta Zhangy | 9 years ago
  1. 0

    HELP!!!

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    java.lang.NullPointerException
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    NullPointerException in main thread

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    java.lang.NullPointerException
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    mouse listener to JLabels

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    java.lang.NullPointerException
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    java.lang.NullPointerException
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    java.lang.NullPointerException

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Root Cause Analysis

  1. java.lang.NullPointerException

    No message provided

    at java.awt.Container.addImpl()
  2. Java RT
    Container.add
    1. java.awt.Container.addImpl(Unknown Source)
    2. java.awt.Container.add(Unknown Source)
    2 frames
  3. Unknown
    Q_3$2.run
    1. Q_3.createBackgroundPanel(Q_3.java:33)
    2. Q_3.createGUI(Q_3.java:24)
    3. Q_3.<init>(Q_3.java:15)
    4. Q_3$2.run(Q_3.java:72)
    4 frames
  4. Java RT
    EventDispatchThread.run
    1. java.awt.event.InvocationEvent.dispatch(Unknown Source)
    2. java.awt.EventQueue.dispatchEvent(Unknown Source)
    3. java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    4. java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    5. java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    6. java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    7. java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    8. java.awt.EventDispatchThread.run(Unknown Source)
    8 frames