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https://issues.apache.org/jira/browse/WW-4604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15130021#comment-15130021
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Christoph Nenning commented on WW-4604:
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I had a similar issue while working on pr#85 in showcase app. That app was
still referencing tiles dtd 2.0 while struts 2.5 switched to tiles 3.0.
So tiles jars on classpath contained a dtd for 3.0 but the file stated 2.0.
Thus tiles tried to download that dtd. We had the same issue in our apps with
dtd of struts 2.3. (we did upgrade struts but not dtd in our struts.xml)
> Missing tiles-config_3_0.dtd
> ----------------------------
>
> Key: WW-4604
> URL: https://issues.apache.org/jira/browse/WW-4604
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - Tiles
> Affects Versions: 2.5
> Environment: Linux/Tomcat 8
> Reporter: Greg Huber
> Priority: Minor
> Attachments: tiles_error.txt
>
>
> If there is no internet connection when struts starts and there is a dtd
> definition in the tiles.xml, tiles throws and exception :
> org.apache.tiles.definition.DefinitionsFactoryException: I/O Error reading
> definitions.
> There seems to be no tiles-config_3_0.dtd in the tiles jars.
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