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https://issues.apache.org/jira/browse/JAMES-3961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17785435#comment-17785435
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Benoit Tellier commented on JAMES-3961:
---------------------------------------

> Should we switch our modules to Jigsaw modules?

 - Now that attributes serialization no longer relies on FST (and no longer 
allows arbitrary deserialisation) we *could* try to better enforce Java modules.

> Should we maintain a JDK11 version in parallel for letting time for everybody 
> to do the switch?

-1

James is still a moving project. We can announce that James 3.8.x is the last 
Java 11 compatible branch, and offer support for it. 

> Migrate code base to JDK21
> --------------------------
>
>                 Key: JAMES-3961
>                 URL: https://issues.apache.org/jira/browse/JAMES-3961
>             Project: James Server
>          Issue Type: Improvement
>            Reporter: René Cordier
>            Priority: Major
>             Fix For: 3.9.0
>
>
> The community seems in favor of adopting JDK 21 and migrating the code base 
> to it. Multiple reasons for it:
>  * JDK 11 reached officially EOL 
>  * JDK 21 is the latest LTS
>  * multiple new features like records (bye bye boilerplates on POJOs), 
> pattern matching, better GC, better thread management, ...
> Few things to keep in mind as well:
>  * should we switch our modules to Jigsaw modules?
>  * should we maintain a JDK11 version in parallel for letting time for 
> everybody to do the switch?
> How:
>  * ADR explaining the change
>  * switch the JDK to 21 in the code base
>  * modify the code to get a green build with minimal changes first
>  * update documentation accordingly
>  * can refactoring things little by little after (like switching to records 
> for POJOs for example)



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