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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:394)	at java.util.Properties.setProperty(Properties.java:143)	at com.sun.am.AMConfigurator.generateConfiguration(AMConfigurator.java:771)	at com.sun.am.AMConfigurator.main(AMConfigurator.java:366)	at com.sun.am.AMConfigurator.configure(AMConfigurator.java:1879)	at com.sun.enterprise.addons.AddonConfigurationController.invokeApi(AddonConfigurationController.java:270)	at com.sun.enterprise.addons.AddonConfigurationController.configure(AddonConfigurationController.java:169)