WSO2 IS 5.0.0中使用Facebook联合身份验证的SAML SSO失败

我跟随这篇博文使用Facebook联合身份验证进行SAML SSO。一切正常，直到Facebook在验证后将请求重定向回webapp。在这一点上，控制台给出了以下异常：

[2014-06-02 08:06:36,822] ERROR {org.wso2.carbon.identity.sso.saml.builders.DefaultResponseBuilder} -  Error when reading claim values for generating SAML Response
java.lang.NullPointerException
    at org.wso2.carbon.utils.multitenancy.MultitenantUtils.getTenantAwareUsername(MultitenantUtils.java:50)
    at org.wso2.carbon.identity.sso.saml.builders.DefaultResponseBuilder.buildSAMLAssertion(DefaultResponseBuilder.java:135)
    at org.wso2.carbon.identity.sso.saml.builders.DefaultResponseBuilder.buildResponse(DefaultResponseBuilder.java:69)
    at org.wso2.carbon.identity.sso.saml.processors.SPInitSSOAuthnRequestProcessor.process(SPInitSSOAuthnRequestProcessor.java:161)
    at org.wso2.carbon.identity.sso.saml.SAMLSSOService.authenticate(SAMLSSOService.java:140)
    at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.handleAuthenticationReponseFromFramework(SAMLSSOProviderServlet.java:546)
    at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.handleRequest(SAMLSSOProviderServlet.java:163)
    at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.doGet(SAMLSSOProviderServlet.java:91)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
    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:848)
    at org.wso2.carbon.tomcat.ext.servlet.DelegationServlet.service(DelegationServlet.java:68)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.wso2.carbon.tomcat.ext.filter.CharacterSetFilter.doFilter(CharacterSetFilter.java:61)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.wso2.carbon.tomcat.ext.valves.CompositeValve.continueInvocation(CompositeValve.java:178)
    at org.wso2.carbon.tomcat.ext.valves.CarbonTomcatValve$1.invoke(CarbonTomcatValve.java:47)
    at org.wso2.carbon.webapp.mgt.TenantLazyLoaderValve.invoke(TenantLazyLoaderValve.java:56)
    at org.wso2.carbon.tomcat.ext.valves.TomcatValveContainer.invokeValves(TomcatValveContainer.java:47)
    at org.wso2.carbon.tomcat.ext.valves.CompositeValve.invoke(CompositeValve.java:141)
    at org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:156)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:52)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1653)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
[2014-06-02 08:06:36,823] ERROR {org.wso2.carbon.identity.sso.saml.processors.SPInitSSOAuthnRequestProcessor} -  Error processing the authentication request
org.wso2.carbon.identity.base.IdentityException: Error when reading claim values for generating SAML Response
    at org.wso2.carbon.identity.sso.saml.builders.DefaultResponseBuilder.buildSAMLAssertion(DefaultResponseBuilder.java:220)
    at org.wso2.carbon.identity.sso.saml.builders.DefaultResponseBuilder.buildResponse(DefaultResponseBuilder.java:69)
    at org.wso2.carbon.identity.sso.saml.processors.SPInitSSOAuthnRequestProcessor.process(SPInitSSOAuthnRequestProcessor.java:161)
    at org.wso2.carbon.identity.sso.saml.SAMLSSOService.authenticate(SAMLSSOService.java:140)
    at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.handleAuthenticationReponseFromFramework(SAMLSSOProviderServlet.java:546)
    at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.handleRequest(SAMLSSOProviderServlet.java:163)
    at org.wso2.carbon.identity.sso.saml.servlet.SAMLSSOProviderServlet.doGet(SAMLSSOProviderServlet.java:91)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
    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:848)
    at org.wso2.carbon.tomcat.ext.servlet.DelegationServlet.service(DelegationServlet.java:68)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.wso2.carbon.tomcat.ext.filter.CharacterSetFilter.doFilter(CharacterSetFilter.java:61)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.wso2.carbon.tomcat.ext.valves.CompositeValve.continueInvocation(CompositeValve.java:178)
    at org.wso2.carbon.tomcat.ext.valves.CarbonTomcatValve$1.invoke(CarbonTomcatValve.java:47)
    at org.wso2.carbon.webapp.mgt.TenantLazyLoaderValve.invoke(TenantLazyLoaderValve.java:56)
    at org.wso2.carbon.tomcat.ext.valves.TomcatValveContainer.invokeValves(TomcatValveContainer.java:47)
    at org.wso2.carbon.tomcat.ext.valves.CompositeValve.invoke(CompositeValve.java:141)
    at org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:156)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:52)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1653)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
    at org.wso2.carbon.utils.multitenancy.MultitenantUtils.getTenantAwareUsername(MultitenantUtils.java:50)
    at org.wso2.carbon.identity.sso.saml.builders.DefaultResponseBuilder.buildSAMLAssertion(DefaultResponseBuilder.java:135)
    ... 40 more

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你能帮我解决这个问题吗

WSO2Identity Server 5.0.0中的Facebook验证器设计用于Graph API 1.0，但目前Facebook对v2.0的支持，这就是可能出现此问题的原因。因此，您可以编写一个新的Facebook验证器并插入Identity server。请访问org.wso2.carbon.identity.application.authenticator.facebook以获取实施细节

实际上，当我为这个验证器启用调试时，我可以看到一切正常。很好！那么哪里会出问题呢？我们能纠正吗？经过一些调试后，我发现问题发生在244行的类。现在我们要做的是，String authenticatedUser=（String）jsonObject.get（FacebookAuthenticatorConstants.USERNAME）；这里USERNAME=USERNAME，但json对象映射中没有这样的属性。通过纠正这个问题，我认为我们可以解决这个问题。