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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 Oracle Community by 626982, 1 year ago
This exception has no message.
via Google Groups by Unknown author, 7 months ago
This exception has no message.
via Google Groups by Davide Piazza, 8 months ago
This exception has no message.
java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:474)	at oracle.ias.repca.RepCAModel.setProperty(RepCAModel.java:57)	at oracle.ias.repca.ext.prereq.PreReqCheckEngine.parseArgs(PreReqCheckEngine.java:159)	at oracle.ias.repca.ext.prereq.PreReqCheckEngine.main(PreReqCheckEngine.java:63)