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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:380)	at org.apache.tomcat.startup.Tomcat.execute(Tomcat.java:114)	at org.apache.tomcat.startup.Tomcat.main(Tomcat.java:223)