The struts-config.xml file is used for action mapping. The action tag has a forward entries. Chaining actions can be done by simply using the proper mapping in your forward entries.

 public class FirstAction extends Action
    {
    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception
    {
    // Developer Logic
    return mapping.findForward("success");
    }
    }

    /* com/SecondAction.java */
    ...

    public class SecondAction extends Action
    {
    public ActionForward execute(ActionMapping mapping, 
ActionForm form, HttpServletRequest request, 
HttpServletResponse response) throws]

    Exception
    {
    // Another Logic

    return mapping.findForward("success");
    }
    }

    For chaining action of these two action the code of action in struts-config.xml file.

    <action-mappings type="org.apache.struts.action.ActionMapping">
    <action path="/First"
    type="com.FirstAction"
    validate="false">
    <forward name="success" path="/Second.do" />
    </action>
    <action path="/Second"
    type="com.SecondAction"
    scope="session"
    validate="false">
    <forward name="success" path="/Output.jsp" />
    </action>
    </action-mappings>

Thanks.