我有一个可行的系统，但在一段时间后我遇到了这样的问题：
2017-08-31 15:31:00 ERROR UT005023: Exception handling request to /spring-security-saml2-sample/saml/login: javax.servlet.ServletException: org.opensaml.saml2.metadata.provider.MetadataProviderException: Metadata for entity ****** and role {urn:oasis:names:tc:SAML:2.0:metadata}IDPSSODescriptor wasn't found
2017-08-31 15:31:02,922 ERROR [io.undertow.request] (default task-29) UT005023: Exception handling request to /spring-security-saml2-sample/: org.apache.jasper.JasperException: java.lang.NullPointerException
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:473)
我的＆＃34;表达＆＃34;解决方案是重新启动wildfly，但我想明确解决它。我该怎么办？