Try this:
In struts-config.xml define an forward for the first action named
success which points to the second action.
If you return arg0.findForward("success") (arg0 = ActionMapping) your
Request will be forwarded to the next Action.

Example:

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

//Forwards the Request to the Action defined in struts-config.xml under
TestAction.
public class TestAction extends Action {

    public ActionForward execute(
        ActionMapping arg0,
        ActionForm arg1,
        HttpServletRequest arg2,
        HttpServletResponse arg3)
        throws IOException, ServletException {

        return arg0.findForward("success");
    }
}