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https://issues.apache.org/jira/browse/TAPESTRY-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12619395#action_12619395
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Andres March commented on TAPESTRY-2421:
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WTF, a package refactoring and class renaming in a patch?  At least some 
documentation on where to find the constants would have been a good idea.

> Allow Tapestry4/Tapestry5 to be deployed in the same WAR
> --------------------------------------------------------
>
>                 Key: TAPESTRY-2421
>                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2421
>             Project: Tapestry
>          Issue Type: New Feature
>          Components: tapestry-core
>    Affects Versions: 5.0.11
>            Reporter: Howard M. Lewis Ship
>            Assignee: Howard M. Lewis Ship
>             Fix For: 5.0.12
>
>
> The main opposition to deploying a WAR containing both the T4 and the T5 
> libraries is class name conflicts in the org.apache.tapestry package.
> For a brief time, it was considered to rename org.apache.tapestry to 
> org.apache.tapestry5.
> However, more research shows that there are only three naming conflicts:
> org.apache.tapestry.PageRenderSupport
> org.apache.tapestry.TapestryConstants
> org.apache.tapestry.TapestryUtils
> These could be rename or otherwise refactored to avoid the conflicts.
> In theory, and with a small amount of configuration, it should be possible to 
> run Tapestry 4 and Tapestry 5 side-by-side in the same WAR.  The shared 
> third-party dependencies, such as commons-logging and Javassist, should be 
> compatible.
> T4 Friendly URLs might have to be disabled, however; otherwise it becomes 
> very difficult to determine which requests are for T5 and which are for T4.
> Tapestry 3 has no overlap with Tapestry 5.

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