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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.<init>(UserManagement.java:75) at com.webportal.UserManagement.main(UserManagement.java:121)