我尝试运行https://github . com/spring-projects/spring-security-SAML(主版本)上提供的应用程序，选择选项http://idp.ssocircle.com并单击开始单点登录按钮，然后单击继续SAML-单点登录，然后它将我带到错误页面，我得到如下严重错误:路径为[/spring-security-SAML 2-sample 3]的上下文中的servlet [default]的Servlet.service()抛出异常java.lang.NullPointerException

at org.springframework.security.saml.processor.HTTPPAOS11Binding.supports(HTTPPAOS11Binding.java:45)
at org.springframework.security.saml.processor.SAMLProcessorImpl.getBinding(SAMLProcessorImpl.java:260)
at org.springframework.security.saml.processor.SAMLProcessorImpl.retrieveMessage(SAMLProcessorImpl.java:172)
at org.springframework.security.saml.SAMLProcessingFilter.attemptAuthentication(SAMLProcessingFilter.java:80)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:195)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)

• SecurityContext为空或内容为匿名-上下文不会存储在HttpSession中。
• SecurityContextHolder现已清除，请求处理已完成