我在项目中使用wso2is-5.2作为身份服务器。在我的项目中，首先我登录一个应用程序（Suppose ULW is this application）并使用single sign on，我也登录其他应用程序(Suppose other applications are Data Manager and Data Populater)。我可以从ULW注销但是当我从 *Data Manager or Data Populator* 注销时，我得到例外 -
ERROR {org.wso2.carbon.identity.sso.saml.processors.SPInitLogoutRequestProcessor} - Error in retrieving Session Index from ssoTokenId cookie : 3f1d4681-a04d-4a84-a75c-634213b2c3ba
TID: [-1234] [] [2016-12-23 15:16:22,427] ERROR {org.wso2.carbon.identity.application.authentication.framework.handler.request.impl.DefaultRequestCoordinator} - Exception in Authentication Framework
java.lang.NullPointerException
at org.wso2.carbon.identity.application.authentication.framework.cache.SessionContextCacheKey.hashCode(SessionContextCacheKey.java:54)
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
at org.wso2.carbon.caching.impl.CacheImpl.get(CacheImpl.java:194)
at org.wso2.carbon.identity.application.common.cache.BaseCache.getValueFromCache(BaseCache.java:158)
at org.wso2.carbon.identity.application.authentication.framework.cache.SessionContextCache.getValueFromCache(SessionContextCache.java:61)
at org.wso2.carbon.identity.application.authentication.framework.util.FrameworkUtils.getSessionContextFromCache(FrameworkUtils.java:632)
at org.wso2.carbon.identity.application.authentication.framework.handler.request.impl.DefaultLogoutRequestHandler.handle(DefaultLogoutRequestHandler.java:140)
at org.wso2.carbon.identity.application.authentication.framework.handler.request.impl.DefaultRequestCoordinator.handle(DefaultRequestCoordinator.java:140)
at org.wso2.carbon.identity.application.authentication.framework.CommonAuthenticationHandler.doPost(CommonAuthenticationHandler.java:46)
at org.wso2.carbon.identity.application.authentication.framework.CommonAuthenticationHandler.doGet(CommonAuthenticationHandler.java:37)
at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.sendRequestToFramework(SAMLSSOProviderServlet.java:1040)
at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.sendToFrameworkForLogout(SAMLSSOProviderServlet.java:517)
at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.handleSPInitSSO(SAMLSSOProviderServlet.java:381)
at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.handleRequest(SAMLSSOProviderServlet.java:195)
at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.doGet(SAMLSSOProviderServlet.java:95)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.eclipse.equinox.http.helper.ContextPathServletAdaptor.service(ContextPathServletAdaptor.java:37)
at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:128)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.wso2.carbon.tomcat.ext.servlet.DelegationServlet.service(DelegationServlet.java:68)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.filters.HttpHeaderSecurityFilter.doFilter(HttpHeaderSecurityFilter.java:120)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.filters.HttpHeaderSecurityFilter.doFilter(HttpHeaderSecurityFilter.java:120)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.wso2.carbon.tomcat.ext.filter.CharacterSetFilter.doFilter(CharacterSetFilter.java:61)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.filters.HttpHeaderSecurityFilter.doFilter(HttpHeaderSecurityFilter.java:120)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.wso2.carbon.tomcat.ext.valves.CompositeValve.continueInvocation(CompositeValve.java:99)
at org.wso2.carbon.tomcat.ext.valves.CarbonTomcatValve$1.invoke(CarbonTomcatValve.java:47)
at org.wso2.carbon.webapp.mgt.TenantLazyLoaderValve.invoke(TenantLazyLoaderValve.java:57)
at org.wso2.carbon.tomcat.ext.valves.TomcatValveContainer.invokeValves(TomcatValveContainer.java:47)
at org.wso2.carbon.tomcat.ext.valves.CompositeValve.invoke(CompositeValve.java:62)
at org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:159)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:57)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1756)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1715)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)