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

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java.lang.NullPointerException	at com.sun.enterprise.deployment.backend.OptionalPkgDependency.satisfyOptionalPackageDependencies(OptionalPkgDependency.java:183)	at com.sun.enterprise.server.J2EEServer.run(J2EEServer.java:281)	at com.sun.enterprise.server.J2EEServer.main(J2EEServer.java:600)	at com.sun.enterprise.server.ApplicationServer.onInitialization(ApplicationServer.java:232)	at com.sun.enterprise.server.PEMain.run(PEMain.java:210)	at com.sun.enterprise.server.PEMain.main(PEMain.java:172)	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:324)	at org.apache.commons.launcher.ChildMain.run(ChildMain.java:269)