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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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via Eclipse Bugzilla by minfrin, 1 year ago
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This exception has no message.
java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:391)	at undefined.ConnectDB.getActiveMember(ConnectDB.java:55)	at undefined.MultiConferenceGUI.setActiveMember(MultiConferenceGUI.java:378)	at undefined.MultiConferenceGUI.(MultiConferenceGUI.java:99)	at undefined.StartConferenceStudGUI.actionPerformed(StartConferenceStudGUI.java:263)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1767)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1820)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:258)	at java.awt.Component.processMouseEvent(Component.java:5021)	at java.awt.Component.processEvent(Component.java:4818)	at java.awt.Container.processEvent(Container.java:1380)	at java.awt.Component.dispatchEventImpl(Component.java:3526)	at java.awt.Container.dispatchEventImpl(Container.java:1437)	at java.awt.Component.dispatchEvent(Component.java:3367)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3214)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2929)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2859)	at java.awt.Container.dispatchEventImpl(Container.java:1423)	at java.awt.Window.dispatchEventImpl(Window.java:1566)	at java.awt.Component.dispatchEvent(Component.java:3367)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)