我尝试Spring SAML 1.0.0.RELEASE通过执行以下步骤来重现您的问题：
但我无法重现您的问题，一切都会按预期进行。该问题可能特定于某些Tomcat版本，请尝试按照我的步骤重现该问题，并最终尝试更改您的Tomcat版本。
正如您提到的，当直接部署到Tomcat时，我能够复制它。该defaultservlet的似乎跳过在定义的过滤器执行/*。以下配置将为您工作：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Spring Security SAML</display-name>
<description>Sample application demonstrating Spring security SAML integration.</description>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/securityContext.xml
</param-value>
</context-param>
<servlet>
<servlet-name>saml</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>saml</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>jsp</servlet-name>
<url-pattern>/WEB-INF/*</url-pattern>
</servlet-mapping>
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>/images/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>/css/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.gif</url-pattern>
</servlet-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<error-page>
<exception-type>java.lang.Exception</exception-type>
<location>/error.jsp</location>
</error-page>
</web-app>
确保更改文件org.springframework.security.saml.web.MetadataController并替换@RequestMapping("/Metadata")为@RequestMapping("/saml/web/Metadata")
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