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https://issues.apache.org/jira/browse/WW-3825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13281153#comment-13281153
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Dave Newton commented on WW-3825:
---------------------------------
If the model isn't in session, it's going to create a new model instance, and
however fields that aren't on the form are initialized is what will be in the
model.
If you using a persistent object directly, then your code needs to take that in
to account, how to do so depends on the persistence mechanism you're using.
> Struts2 (modeldriven) update method setting fields which do not exist on form
> to null
> -------------------------------------------------------------------------------------
>
> Key: WW-3825
> URL: https://issues.apache.org/jira/browse/WW-3825
> Project: Struts 2
> Issue Type: Improvement
> Affects Versions: 2.3.1.2
> Reporter: Sam
> Priority: Critical
>
> Struts 2 sets the fields values to Null, if it doesn't exists on view/jsp.
> See below link.
> http://forums.devshed.com/java-help-9/struts2-modeldriven-update-method-setting-fields-which-do-not-exist-642900.html
> I am forced to put all non view fields as HIDDEN on JSP page, to have it
> values transferred.
> Is there a way to retain the values of non form fields without using HIDDEN.
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