Struts2 Version 2.0.x handles unknown actions

In struts2 version 2.1.x, a new UnknownHandler appears that is triggered when a request comes in and the action name cannot be found.

The question is: what is the equivalent mechanism if it exists in versions 2.0.x?

I recently noticed from looking at the log files that throw exceptions when the action name is not properly resolved and this actually causes some problems. Is there a broad app customization to work with this?

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Default value or default action?

http://struts.apache.org/2.0.14/docs/action-configuration.html#ActionConfiguration-WildcardMethod

<action name="*">
  <result>/{1}.jsp</result>
</action>

      



...

<package name="Hello" extends="action-default">

    <default-action-ref name="UnderConstruction">

    <action name="UnderConstruction">
        <result>/UnderConstruction.jsp</result>
    </action>

    ...

      

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