我是OpenAM的新手，并尝试通过设置涉及SAML2服务提供商，SAML2 IdP服务器，SAML2 IdP代理的身份验证解决方案来学习。
我能够在指南SAMLv2 IDP Proxy Part 1. Setting up a simple Proxy scenario中设置服务提供商，身份提供商，目前正处于设置IdP代理“步骤3：配置身份提供商代理（machineb）”的阶段。 我能够完成“第3步：b”，当我尝试“第3步：c”时，我得到了空指针异常。
我的设置略有不同，我可以像这样映射：
machinea.sp.com是http://sp1.sp.com:8080：将充当SAML2服务提供商（SP）的计算机machineb.idpproxy.com是http://openam.idam.com:8080/OpenAM-11.0.0：将用作SAML2 IdP代理的计算机machinec.idp.com是http://idp1.idp.com:8080/OpenAM-11.0.0：将承担SAML2 IdP角色的计算机。每个都在我的Mac OS X上设置为虚拟盒虚拟机。
我的信任圈是spcot而不是cot，而领域是/sprealm。
提交更改后我在网页上看到的堆栈跟踪是：
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: AMSetupFilter.doFilter
com.sun.identity.setup.AMSetupFilter.doFilter(AMSetupFilter.java:134)
root cause
org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.forgerock.openam.validation.ResponseValidationFilter.doFilter(ResponseValidationFilter.java:44)
com.sun.identity.setup.AMSetupFilter.doFilter(AMSetupFilter.java:98)
root cause
java.lang.NullPointerException
com.sun.identity.federation.cli.CreateMetaDataTemplate.buildConfigTemplate(CreateMetaDataTemplate.java:573)
com.sun.identity.federation.cli.CreateMetaDataTemplate.handleSAML2Request(CreateMetaDataTemplate.java:154)
com.sun.identity.federation.cli.CreateMetaDataTemplate.handleRequest(CreateMetaDataTemplate.java:127)
com.sun.identity.cli.SubCommand.execute(SubCommand.java:291)
com.sun.identity.cli.CLIRequest.process(CLIRequest.java:212)
com.sun.identity.cli.CLIRequest.process(CLIRequest.java:134)
com.sun.identity.cli.CommandManager.serviceRequestQueue(CommandManager.java:573)
com.sun.identity.cli.WebCLIHelper.processRequest(WebCLIHelper.java:151)
com.sun.identity.cli.WebCLIHelper.getHTML(WebCLIHelper.java:92)
org.apache.jsp.ssoadm_jsp._jspService(ssoadm_jsp.java:148)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.forgerock.openam.validation.ResponseValidationFilter.doFilter(ResponseValidationFilter.java:44)
com.sun.identity.setup.AMSetupFilter.doFilter(AMSetupFilter.java:98)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.26 logs.
Apache Tomcat/7.0.26
catalina.out中的堆栈跟踪是：
org.apache.jasper.JasperException: java.lang.NullPointerException
at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.forgerock.openam.validation.ResponseValidationFilter.doFilter(ResponseValidationFilter.java:44)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.sun.identity.setup.AMSetupFilter.doFilter(AMSetupFilter.java:98)
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:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
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:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
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:745)
Caused by: java.lang.NullPointerException
at com.sun.identity.federation.cli.CreateMetaDataTemplate.buildConfigTemplate(CreateMetaDataTemplate.java:573)
at com.sun.identity.federation.cli.CreateMetaDataTemplate.handleSAML2Request(CreateMetaDataTemplate.java:154)
at com.sun.identity.federation.cli.CreateMetaDataTemplate.handleRequest(CreateMetaDataTemplate.java:127)
at com.sun.identity.cli.SubCommand.execute(SubCommand.java:291)
at com.sun.identity.cli.CLIRequest.process(CLIRequest.java:212)
at com.sun.identity.cli.CLIRequest.process(CLIRequest.java:134)
at com.sun.identity.cli.CommandManager.serviceRequestQueue(CommandManager.java:573)
at com.sun.identity.cli.WebCLIHelper.processRequest(WebCLIHelper.java:151)
at com.sun.identity.cli.WebCLIHelper.getHTML(WebCLIHelper.java:92)
at org.apache.jsp.ssoadm_jsp._jspService(ssoadm_jsp.java:148)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
... 25 more
请帮我解决这个问题。谢谢。