java.lang.NullPointerException

Stack Overflow | Java Beginner | 5 months ago
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  1. 0

    Referencing other class gives me errors

    Stack Overflow | 5 months ago | Java Beginner
    java.lang.NullPointerException

    Root Cause Analysis

    1. java.lang.NullPointerException

      No message provided

      at Panel.update()
    2. Unknown
      Panel.actionPerformed
      1. Panel.update(Panel.java:44)
      2. Panel.actionPerformed(Panel.java:50)
      2 frames
    3. Java RT
      EventDispatchThread.run
      1. javax.swing.Timer.fireActionPerformed(Unknown Source)
      2. javax.swing.Timer$DoPostEvent.run(Unknown Source)
      3. java.awt.event.InvocationEvent.dispatch(Unknown Source)
      4. java.awt.EventQueue.dispatchEventImpl(Unknown Source)
      5. java.awt.EventQueue.access$500(Unknown Source)
      6. java.awt.EventQueue$3.run(Unknown Source)
      7. java.awt.EventQueue$3.run(Unknown Source)
      8. java.security.AccessController.doPrivileged(Native Method)
      9. java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
      10. java.awt.EventQueue.dispatchEvent(Unknown Source)
      11. java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
      12. java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
      13. java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
      14. java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      15. java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      16. java.awt.EventDispatchThread.run(Unknown Source)
      16 frames