java.lang.NullPointerException

Stack Overflow | ANiK3T | 10 months ago
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  1. 0

    how do i dynamically add and remove elements in JList?

    Stack Overflow | 10 months ago | ANiK3T
    java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at PrefApp.AddButtonActionPerformed()
    2. Unknown
      PrefApp$4.actionPerformed
      1. PrefApp.AddButtonActionPerformed(PrefApp.java:222)
      2. PrefApp.access$100(PrefApp.java:12)
      3. PrefApp$4.actionPerformed(PrefApp.java:121)
      3 frames
    3. Java RT
      EventDispatchThread.run
      1. javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
      2. javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
      3. javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
      4. javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
      5. javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
      6. java.awt.Component.processMouseEvent(Component.java:6535)
      7. javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
      8. java.awt.Component.processEvent(Component.java:6300)
      9. java.awt.Container.processEvent(Container.java:2236)
      10. java.awt.Component.dispatchEventImpl(Component.java:4891)
      11. java.awt.Container.dispatchEventImpl(Container.java:2294)
      12. java.awt.Component.dispatchEvent(Component.java:4713)
      13. java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
      14. java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
      15. java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
      16. java.awt.Container.dispatchEventImpl(Container.java:2280)
      17. java.awt.Component.dispatchEvent(Component.java:4713)
      18. java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
      19. java.awt.EventQueue.access$500(EventQueue.java:97)
      20. java.awt.EventQueue$3.run(EventQueue.java:709)
      21. java.awt.EventQueue$3.run(EventQueue.java:703)
      22. java.security.AccessController.doPrivileged(Native Method)
      23. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
      24. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
      25. java.awt.EventQueue$4.run(EventQueue.java:731)
      26. java.awt.EventQueue$4.run(EventQueue.java:729)
      27. java.security.AccessController.doPrivileged(Native Method)
      28. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
      29. java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
      30. java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
      31. java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
      32. java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
      33. java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
      34. java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
      35. java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
      35 frames