Struts 2 override the interceptor parameters

In Struts 2, you can set or override the interceptor parameters via the generic <param> tag. See below example

<package name="default" namespace="/" extends="struts-default">
   <action name="whateverAction" 
    class="com.mkyong.common.action.WhateverAction" >
    <interceptor-ref name="workflow">
        <param name="excludeMethods">whateverMethod</param>
    </interceptor-ref>
    <result name="success">pages/whatever.jsp</result>
   </action>        
</package>

However, in above snippet, the action class is declared it’s own interceptor, and it will cause the immediate lose of the inherit “defaultStack” interceptors.

What if you want to keep the “defaultStack” interceptors, and override the workflow’s excludeMethods parameter as well? No problem, try this

<package name="default" namespace="/" extends="struts-default">
   <action name="whateverAction" 
    class="com.mkyong.common.action.WhateverAction" >
    <interceptor-ref name="defaultStack">
        <param name="workflow.excludeMethods">whateverMethod</param>
    </interceptor-ref>
    <result name="success">pages/whatever.jsp</result>
   </action>        
</package>

The above snippet will keep the “defaultStack” interceptor and override the “workflow” parameter.