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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, 2 years ago
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via Oracle Community by 843802, 2 years ago
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via Google Groups by Jeremy Custenborder, 1 year ago
via Oracle Community by 807573, 1 year ago
This exception has no message.
java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:391) at ConnectDB.getActiveMember(ConnectDB.java:55) at MultiConferenceGUI.setActiveMember(MultiConferenceGUI.java:378) at MultiConferenceGUI.<init>(MultiConferenceGUI.java:99) at 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)