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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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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:459)	at java.util.Properties.setProperty(Properties.java:166)	at oracle.dbtools.raptor.onsd.connection.NSConnection.open(NSConnection.java:115)	at oracle.dbtools.raptor.onsd.connection.ConnectionCreator.createConnection(ConnectionCreator.java:27)	at oracle.dbtools.raptor.onsd.connection.NSConnections$C.getConnection(NSConnections.java:39)	at oracle.dbtools.raptor.onsd.connection.NSConnections.getConnection(NSConnections.java:181)	at oracle.dbtools.raptor.onsd.navigator.OnsdConnection.openConnectionImpl(OnsdConnection.java:166)	at oracle.dbtools.raptor.onsd.navigator.OnsdConnection.openConnectionImpl(OnsdConnection.java:26)	at oracle.dbtools.raptor.navigator.db.BaseConnectionNode.getConnection(BaseConnectionNode.java:46)	at oracle.dbtools.raptor.onsd.navigator.ConnectionTreeNode$LoadTask.doWork(ConnectionTreeNode.java:63)	at oracle.dbtools.raptor.onsd.navigator.ConnectionTreeNode$LoadTask.doWork(ConnectionTreeNode.java:26)	at oracle.dbtools.raptor.backgroundTask.RaptorTask.call(RaptorTask.java:193)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$RaptorFutureTask.run(RaptorTaskManager.java:621)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)