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java.lang.NullPointerException: 	at oracle.security.am.engine.authn.internal.executor.PlugInExecutor.execute(PlugInExecutor.java:197)	at oracle.security.am.engine.authn.internal.executor.AuthenticationSchemeExecutor.execute(AuthenticationSchemeExecutor.java:103)	at oracle.security.am.engine.authn.internal.controller.AuthenticationEngineControllerImpl.validateUser(AuthenticationEngineControllerImpl.java:267)	at oracle.security.am.engines.enginecontroller.AuthnEngineController.authenticateUser(AuthnEngineController.java:816)	at oracle.security.am.engines.enginecontroller.AuthnEngineController.processEvent(AuthnEngineController.java:313)	at oracle.security.am.controller.MasterController.processEvent(MasterController.java:589)	at oracle.security.am.controller.MasterController.processRequest(MasterController.java:780)	at oracle.security.am.proxy.oam.requesthandler.NGProvider.authenticate(NGProvider.java:701)	at oracle.security.am.proxy.oam.requesthandler.NGProvider.getAuthenticateForDccResponse(NGProvider.java:463)	at oracle.security.am.proxy.oam.requesthandler.NGProvider.getResponse(NGProvider.java:394)	at oracle.security.am.proxy.oam.requesthandler.RequestHandler.handleRequest(RequestHandler.java:346)	at oracle.security.am.proxy.oam.requesthandler.RequestHandler.handleMessage(RequestHandler.java:169)	at oracle.security.am.proxy.oam.requesthandler.ControllerMessageBean.getResponseMessage(ControllerMessageBean.java:122)	at oracle.security.am.proxy.oam.requesthandler.ControllerMessageBean_eo7ylc_MDOImpl.__WL_invoke(Unknown Source)	at weblogic.ejb.container.internal.MDOMethodInvoker.invoke(MDOMethodInvoker.java:35)	at oracle.security.am.proxy.oam.requesthandler.ControllerMessageBean_eo7ylc_MDOImpl.getResponseMessage(Unknown Source)	at oracle.security.am.proxy.oam.mina.ObClientToProxyHandler.messageReceived(ObClientToProxyHandler.java:205)	at org.apache.mina.common.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:743)	at org.apache.mina.common.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:405)	at org.apache.mina.common.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:40)	at org.apache.mina.common.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:823)	at org.apache.mina.common.IoFilterEvent.fire(IoFilterEvent.java:54)	at org.apache.mina.common.IoEvent.run(IoEvent.java:62)	at oracle.security.am.proxy.oam.mina.CommonJWorkImpl.run(CommonJWorkImpl.java:41)	at weblogic.work.j2ee.J2EEWorkManager$WorkWithListener.run(J2EEWorkManager.java:184)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)