Failed to startup Jboss 5.1 -


i on redhat, using jboss 5.1 not able start jboss. working added jar file in lib. throwing error saying 

    failed boot jboss:      java.lang.nullpointerexception      	at org.jboss.main.boot(main.java:136)      	at org.jboss.main$1.run(main.java:556)      	at java.lang.thread.run(thread.java:745)

what can possible cause of ???


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