我做了很多研究，以下是我的发现

I researched a lot and following are my findings

1. Grails Spring Security Saml插件内部使用 Spring Security SAML 插件，以提高灵活性

1. Grails Spring Security Saml Plugin internally uses Spring Security SAML plugin.
2. So it is better to use Spring Security SAML plugin directly for more flexibility.

我遵循了此文档，并添加了插件及其对我的应用程序的配置，现在可以正常运行了. 在Grails中开始使用Spring SAML的新人的***去处是 Grails SSO示例我已经为Grails 2.4.3升级的应用程序.在本地运行该应用程序，了解在此应用程序中完成的配置，然后逐步在您的应用程序中实现这些配置.

I followed this documentation and added plugin and its configurations to my app and now its running fine. The best place to start for a new person on Spring SAML in grails is Grails SSO Sample application which I have upgraded for Grails 2.4.3. Run this app locally and get to know about the configurations done in this application and then implement those in your application step by step.