java.lang.NullPointerException: This exception has no message.

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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)	at com.sun.enterprise.addons.AddonConfigurationController.configureDAS(AddonConfigurationController.java:136)	at com.sun.enterprise.addons.AddonFacade.configureDAS(AddonFacade.java:110)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.sun.enterprise.cli.commands.AddonControl.configureDAS(AddonControl.java:100)	at com.sun.enterprise.cli.commands.StartDomainCommand.configureAddons(StartDomainCommand.java:489)	at com.sun.enterprise.cli.commands.StartDomainCommand.init(StartDomainCommand.java:458)	at com.sun.enterprise.cli.commands.StartDomainCommand.startDomain(StartDomainCommand.java:123)	at com.sun.enterprise.cli.commands.StartDomainCommand.runCommand(StartDomainCommand.java:215)	at com.sun.enterprise.cli.framework.CLIMain.invokeCommand(CLIMain.java:171)	at com.sun.enterprise.cli.framework.CLIMain.main(CLIMain.java:79)