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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 Derek DeMoro, 1 year ago
This exception has no message.
via JIRA by Derek DeMoro, 1 year ago
This exception has no message.
via Jive Software Open Source by Derek DeMoro, 1 year ago
This exception has no message.
via Stack Overflow by Gyowanny Pessatto Queiroz
, 2 years ago
This exception has no message.
via liferay.com by Unknown author, 2 years ago
java.lang.NullPointerException at java.util.Hashtable.put(Hashtable.java:396) at java.util.Properties.setProperty(Properties.java:128) at java.lang.System.setProperty(System.java:700) at org.jivesoftware.LoginDialog.updateProxyConfig(LoginDialog.java:766) at org.jivesoftware.LoginDialog.invoke(LoginDialog.java:128) at org.jivesoftware.Spark.<init>(Spark.java:53) at org.jivesoftware.Spark.<init>(Spark.java:37) at org.jivesoftware.Spark$1.run(Spark.java:121) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:461) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)