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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 Google Groups by Unknown author, 1 year ago
via Google Groups by Sean Zhong, 1 year ago
via Stack Overflow by user2309066
, 2 years ago
java.lang.NullPointerException: value == null	at java.util.Hashtable.put(Hashtable.java:362)	at userclasses.StateMachine.onMain_ButtonAction(StateMachine.java:75)