java.lang.NullPointerException

Stack Overflow | Java Beginner | 6 months ago
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  1. 0

    Referencing other class gives me errors

    Stack Overflow | 6 months ago | Java Beginner
    java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at Panel.paintComponent()
    2. Unknown
      Panel.paintComponent
      1. Panel.paintComponent(Panel.java:71)
      1 frame
    3. Java RT
      EventDispatchThread.run
      1. javax.swing.JComponent.paint(Unknown Source)
      2. javax.swing.JComponent.paintChildren(Unknown Source)
      3. javax.swing.JComponent.paint(Unknown Source)
      4. javax.swing.JComponent.paintChildren(Unknown Source)
      5. javax.swing.JComponent.paint(Unknown Source)
      6. javax.swing.JLayeredPane.paint(Unknown Source)
      7. javax.swing.JComponent.paintChildren(Unknown Source)
      8. javax.swing.JComponent.paintToOffscreen(Unknown Source)
      9. javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
      10. javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
      11. javax.swing.RepaintManager.paint(Unknown Source)
      12. javax.swing.JComponent.paint(Unknown Source)
      13. java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
      14. sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
      15. sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
      16. java.awt.Container.paint(Unknown Source)
      17. java.awt.Window.paint(Unknown Source)
      18. javax.swing.RepaintManager$4.run(Unknown Source)
      19. javax.swing.RepaintManager$4.run(Unknown Source)
      20. java.security.AccessController.doPrivileged(Native Method)
      21. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
      22. javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
      23. javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
      24. javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
      25. javax.swing.RepaintManager.access$1200(Unknown Source)
      26. javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
      27. java.awt.event.InvocationEvent.dispatch(Unknown Source)
      28. java.awt.EventQueue.dispatchEventImpl(Unknown Source)
      29. java.awt.EventQueue.access$500(Unknown Source)
      30. java.awt.EventQueue$3.run(Unknown Source)
      31. java.awt.EventQueue$3.run(Unknown Source)
      32. java.security.AccessController.doPrivileged(Native Method)
      33. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
      34. java.awt.EventQueue.dispatchEvent(Unknown Source)
      35. java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
      36. java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
      37. java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
      38. java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      39. java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      40. java.awt.EventDispatchThread.run(Unknown Source)
      40 frames