Hey Gavi,
I face the same problem. I'm using the tiles and dispatcher action. so if I add the validate="true" on the struts-config.xml it will error like this :
javax.servlet.ServletException: java.lang.IllegalArgumentException: The path of an ForwardConfig cannot be null
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
and also if I added the input on the action tag, the tiles will not working correctly.. How do I fix this problem? Thanks before