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https://issues.apache.org/struts/browse/WW-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=47124#action_47124
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Antoine W commented on WW-2970:
-------------------------------

It looks like I have the same behavior with tomcat. Params interceptor is 
re-setting all parameters from get/post, before each chained action is called.
So if action1 updates one parameter, then chains to action2, action2 will still 
get the initial value reseted by Params.
This is quite annoying... 

> Param set on chained action is re-set on all actions in chain
> -------------------------------------------------------------
>
>                 Key: WW-2970
>                 URL: https://issues.apache.org/struts/browse/WW-2970
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Core Interceptors
>    Affects Versions: 2.1.6
>         Environment: Windows XP SP2.  WebLogic Server 10.0 MP1.  Java 
> HotSpot(TM) Server VM Version 1.5.0_11-b03
>            Reporter: David
>         Attachments: chainapp.zip
>
>
> If a param is set on an action in a chain through struts.xml, it will be set 
> on all subsequent actions in the chain, thus overwriting any values that may 
> have been set by the actions themselves.

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