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

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java.lang.NullPointerException:
at java.lang.String.(String.java:390)
at com.sun.identity.security.AdminPasswordAction.run(AdminPasswordAction.java:86)
at com.iplanet.dpro.session.service.SessionService.(SessionService.java:1557)
at com.iplanet.dpro.session.service.SessionService.getSessionService(SessionService.java:398)
at com.sun.identity.authentication.service.AuthD.getSS(AuthD.java:699)
at com.sun.identity.authentication.service.AuthD.initAuthSessions(AuthD.java:720)
at com.sun.identity.authentication.service.AuthD.(AuthD.java:229)
at com.sun.identity.authentication.service.AuthD.getAuth(AuthD.java:488)
at com.sun.identity.authentication.UI.LoginLogoutMapping.init(LoginLogoutMapping.java:71)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubImpl.java:975)
at weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStubImpl.java:954)
at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:893)
at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.java:3456)
at weblogic.servlet.internal.WebAppServletContext.preloadServlets(WebAppServletContext.java:3413)
at weblogic.servlet.internal.WebAppServletContext.preloadServlets(WebAppServletContext.java:3399)
at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:3382)
at weblogic.servlet.internal.WebAppServletContext.setStarted(WebAppServletContext.java:6262)
at weblogic.j2ee.J2EEApplicationContainer.start(J2EEApplicationContainer.java:2181)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2222)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2169)
at weblogic.management.deploy.slave.SlaveDeployer$Application.setActivation(SlaveDeployer.java:3111)
at weblogic.management.deploy.slave.SlaveDeployer.setActivationStateForAllApplications(SlaveDeployer.java:1769)
at weblogic.management.deploy.slave.SlaveDeployer.resume(SlaveDeployer.java:352)
at weblogic.management.deploy.DeploymentManagerServerLifeCycleImpl.resume(DeploymentManagerServerLifeCycleImpl.java:229)
at weblogic.t3.srvr.SubsystemManager.resume(SubsystemManager.java:136)
at weblogic.t3.srvr.T3Srvr.resume(T3Srvr.java:965)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:360)
at weblogic.Server.main(Server.java:32)

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