java.lang.NullPointerException

Oracle Community | 807593 | 1 decade ago
  1. 0

    Can Someone help me these error messages...

    Oracle Community | 1 decade ago | 807593
    java.lang.NullPointerException
  2. 0

    请问register mbean error异常怎么解决?

    GitHub | 2 years ago | colddew
    java.lang.NullPointerException
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Root Cause Analysis

  1. java.lang.NullPointerException

    No message provided

    at java.util.Hashtable.put()
  2. Java RT
    Hashtable.put
    1. java.util.Hashtable.put(Hashtable.java:391)
    1 frame
  3. Unknown
    StartConferenceStudGUI.actionPerformed
    1. ConnectDB.getActiveMember(ConnectDB.java:55)
    2. MultiConferenceGUI.setActiveMember(MultiConferenceGUI.java:378)
    3. MultiConferenceGUI.<init>(MultiConferenceGUI.java:99)
    4. StartConferenceStudGUI.actionPerformed(StartConferenceStudGUI.java:263)
    4 frames
  4. Java RT
    EventDispatchThread.run
    1. javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1767)
    2. javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1820)
    3. javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)
    4. javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)
    5. javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:258)
    6. java.awt.Component.processMouseEvent(Component.java:5021)
    7. java.awt.Component.processEvent(Component.java:4818)
    8. java.awt.Container.processEvent(Container.java:1380)
    9. java.awt.Component.dispatchEventImpl(Component.java:3526)
    10. java.awt.Container.dispatchEventImpl(Container.java:1437)
    11. java.awt.Component.dispatchEvent(Component.java:3367)
    12. java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3214)
    13. java.awt.LightweightDispatcher.processMouseEvent(Container.java:2929)
    14. java.awt.LightweightDispatcher.dispatchEvent(Container.java:2859)
    15. java.awt.Container.dispatchEventImpl(Container.java:1423)
    16. java.awt.Window.dispatchEventImpl(Window.java:1566)
    17. java.awt.Component.dispatchEvent(Component.java:3367)
    18. java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
    19. java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)
    20. java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
    21. java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    22. java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
    23. java.awt.EventDispatchThread.run(EventDispatchThread.java:98)
    23 frames