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https://issues.apache.org/jira/browse/OFBIZ-12016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17428631#comment-17428631
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Jacques Le Roux commented on OFBIZ-12016:
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Hi Benjamin,
Please try this patch (on R18, did not test R17): [^OFBIZ-12016.patch]
> DiskFileItem as request attribute creates problems
> --------------------------------------------------
>
> Key: OFBIZ-12016
> URL: https://issues.apache.org/jira/browse/OFBIZ-12016
> Project: OFBiz
> Issue Type: Bug
> Affects Versions: 18.12.01, Trunk
> Reporter: Sebastian Berg
> Assignee: Jacques Le Roux
> Priority: Major
> Fix For: Upcoming Branch
>
> Attachments: OFBIZ-12016.patch
>
>
> Hi,
> while working on a custom project based on the 18.12.01 version, I noticed a
> problem with the request handling during a request-redirect-noparam if a
> DiskFileItem was involved.
> So the situation for me is as follows: during the first request a file is
> uploaded. I choose a wrong format on purpose, which results in an error
> respond for that event. Nevertheless the DiskFileItem is set as request
> attribute together with the error message.
> The request is finished and based on the controller configurations redirected
> to a second request.
> While handling the second request the previous request's attributes get
> restored (RequestHandler.java line 733ff). This goes down into
> SafeObjectInfo.resolveClass() where an Incompatible class exception is
> thrown. I compared my custom project with the current development status and
> worked in the changes from commit 3f60efb343a11723aa56c1bc1f5afac3a2f26e9f in
> OFBIZ-10837.
> While this fixes the issue with the incompatible class exception it also
> makes it impossible to retrieve any attributes from the first request.
> Therefore my error message cannot be shown.
> Is there a way to fix it or is it otherwise necessary to always set
> "fileItems" as request attribute as added in -OFBIZ-11246-?
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