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

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Exception by getAuthenticationProviderMBean()

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howto programatically add users to embeded ldap in wls 7.0

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java.lang.NullPointerException: 	at weblogic.management.commo.CommoProxy.createFreshProxy(CommoProxy.java:576)	at weblogic.management.commo.CommoProxy.getProxyInstance(CommoProxy.java:485)	at weblogic.management.commo.CommoProxy.getCommoProxy(CommoProxy.java:178)	at weblogic.management.commo.CommoProxy.wrap(CommoProxy.java:599)	at weblogic.management.commo.CommoProxy.wrap(CommoProxy.java:609)	at weblogic.management.commo.CommoProxy.invoke(CommoProxy.java:258)	at $Proxy0.getAuthenticationProviders(Unknown Source)	at com.webportal.UserManagement.(UserManagement.java:75)	at com.webportal.UserManagement.main(UserManagement.java:121)