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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.

Solutions on the web

via Jive Software Open Source by Todd Getz, 1 year ago
via JIRA by Todd Getz, 1 year ago
via Jive Software Open Source by Todd Getz, 1 year ago
via GitHub by slandelle
, 2 years ago
This exception has no message.
via GitHub by slandelle
, 2 years ago
This exception has no message.
via processing.org by Unknown author, 1 year ago
java.lang.NullPointerException: 	at java.util.Hashtable.put(Unknown Source)	at javax.swing.text.SimpleAttributeSet.addAttribute(Unknown Source)	at javax.swing.text.StyleConstants.setForeground(Unknown Source)	at org.jivesoftware.spark.ui.TranscriptWindow.insertMessage(TranscriptWindow.java:167)	at org.jivesoftware.spark.ui.rooms.ChatRoomImpl.sendMessage(ChatRoomImpl.java:262)	at org.jivesoftware.spark.ui.rooms.ChatRoomImpl.sendMessage(ChatRoomImpl.java:248)	at org.jivesoftware.spark.ui.rooms.ChatRoomImpl.sendMessage(ChatRoomImpl.java:223)	at org.jivesoftware.spark.ui.ChatRoom.checkForEnter(ChatRoom.java:466)	at org.jivesoftware.spark.ui.ChatRoom.access$100(ChatRoom.java:73)	at org.jivesoftware.spark.ui.ChatRoom$2.keyPressed(ChatRoom.java:251)	at java.awt.AWTEventMulticaster.keyPressed(Unknown Source)	at java.awt.Component.processKeyEvent(Unknown Source)	at javax.swing.JComponent.processKeyEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)