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OAMSSA-20016: Failure getting users by attribute : sAMAccountName, value : national.
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java.lang.NullPointerException: 	at oracle.security.idm.providers.stdldap.LDUser.hashCode(LDUser.java:489)	at java.lang.Object.toString(Object.java:219)	at java.lang.String.valueOf(String.java:2826)	at java.lang.StringBuilder.append(StringBuilder.java:115)	at java.util.AbstractCollection.toString(AbstractCollection.java:422)	at java.lang.String.valueOf(String.java:2826)	at java.lang.StringBuilder.append(StringBuilder.java:115)	at oracle.security.am.engines.common.identity.provider.impl.UserProviderImpl.getUsersByAttribute(UserProviderImpl.java:331)	at oracle.security.am.engines.common.identity.provider.impl.IdentityProviderImpl.getUsersByAttribute(IdentityProviderImpl.java:656)	at oracle.security.am.engines.common.identity.provider.impl.OracleUserIdentityProvider.getUsersByAttribute(OracleUserIdentityProvider.java:288)	at oracle.security.am.engine.authn.internal.executor.KerberosModuleExecutor.execute(KerberosModuleExecutor.java:254)	at oracle.security.am.engine.authn.internal.executor.AuthenticationSchemeExecutor.execute(AuthenticationSchemeExecutor.java:94)	at oracle.security.am.engine.authn.internal.controller.AuthenticationEngineControllerImpl.validateUser(AuthenticationEngineControllerImpl.java:261)	at oracle.security.am.engines.enginecontroller.AuthnEngineController.authenticateUser(AuthnEngineController.java:669)	at oracle.security.am.engines.enginecontroller.AuthnEngineController.processEvent(AuthnEngineController.java:294)	at oracle.security.am.controller.MasterController.processEvent(MasterController.java:354)	at oracle.security.am.controller.MasterController.processRequest(MasterController.java:517)	at oracle.security.am.controller.MasterController.process(MasterController.java:457)	at oracle.security.am.pbl.PBLFlowManager.delegateToMasterController(PBLFlowManager.java:209)	at oracle.security.am.pbl.PBLFlowManager.handleBaseEvent(PBLFlowManager.java:147)	at oracle.security.am.pbl.PBLFlowManager.processRequest(PBLFlowManager.java:107)	at oracle.security.am.pbl.transport.http.AMServlet.handleRequest(AMServlet.java:168)	at oracle.security.am.pbl.transport.http.AMServlet.doPost(AMServlet.java:133)	at oracle.security.am.pbl.transport.http.AMServlet.doGet(AMServlet.java:673)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:183)	at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:523)	at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:253)	at oracle.security.am.pbl.transport.http.CredCollectServlet.getCredentials(CredCollectServlet.java:148)	at oracle.security.am.pbl.transport.http.CredCollectServlet.doPost(CredCollectServlet.java:84)	at oracle.security.am.pbl.transport.http.CredCollectServlet.doGet(CredCollectServlet.java:71)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at oracle.security.am.agent.wls.filters.OAMServletAuthenticationFilter.doFilter(OAMServletAuthenticationFilter.java:265)	at oracle.security.am.agent.wls.filters.OAMValidationSystemFilter.doFilter(OAMValidationSystemFilter.java:133)	at oracle.security.wls.oamagent.OAMAgentWrapperFilter.doFilter(OAMAgentWrapperFilter.java:120)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)	at java.security.AccessController.doPrivileged(Native Method)	at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)	at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)	at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)	at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)	at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)