Question: Can I have more than one struts-config.xml file?

Answer: Yes. A sample configuration in web.xml file would look like this

<servlet>
       <servlet-name>action</servlet-name>
       <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
       <init-param>
              <param-name>config</param-name>
              <param-value>/WEB-INF/struts-config.xml</param-value>
       </init-param>
       <!-- module configurations -->
       <init-param>
              <param-name>config/exercise</param-name>
              <param-value>/WEB-INF/exercise/struts-config.xml</param-value>
       </init-param>
       <init-param>
              <param-name>config/upload</param-name>
              <param-value>/WEB-INF/upload/struts-config.xml</param-value>
       </init-param>
</servlet>