Copy your previous project. Open the pom.xml file and add the following dependencies:

<!-- SAML2 -->
<dependency>
   <groupId>org.springframework.security.extensions</groupId>
   <artifactId>spring-security-saml2-core</artifactId>
   <version>1.0.3.RELEASE</version>
</dependency>
<dependency>
   <groupId>org.springframework.security.extensions</groupId>
   <artifactId>spring-security-saml-dsl-core</artifactId>
   <version>1.0.5.RELEASE</version>
</dependency>