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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 jtds by mhutch
, 1 year ago
This exception has no message.
via Stack Overflow by pacman
, 2 years ago
via oracle.com by Unknown author, 1 year ago
This exception has no message.
via oracle.com by Unknown author, 2 years ago
This exception has no message.
via oracle.com by Unknown author, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at java.util.Hashtable.put(Unknown Source)	at java.util.Properties.setProperty(Unknown Source)	at robocode.manager.RobocodeProperties.store(Unknown Source)	at robocode.manager.RobocodeManager.saveProperties(Unknown Source)	at robocode.Robocode.initialize(Unknown Source)	at robocode.Robocode.main(Unknown Source)