HDIV (HTTP Data Integrity Validator) is a Java Web Application Security Framework. HDIV extends web applications’ behaviour by adding Security functionalities, maintaining the API and the framework specification. This implies that we can use HDIV in applications developed in Struts 1.x, Struts 2.x, Spring MVC and JSTL in a transparent way to the programmer and without adding any complexity to the application development. It is possible to use HDIV in applications that don’t use Struts 1.x, Struts 2.x, Spring MVC or JSTL, but in this case it is necessary to modify the application (JSP pages).
Here it is on SourceForge