[ 
https://issues.apache.org/jira/browse/WICKET-7029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17699478#comment-17699478
 ] 

ASF GitHub Bot commented on WICKET-7029:
----------------------------------------

martin-g commented on code in PR #556:
URL: https://github.com/apache/wicket/pull/556#discussion_r1133495627


##########
pom.xml:
##########
@@ -119,7 +119,8 @@
                <module>wicket-native-websocket</module>
                <module>wicket-bean-validation</module>
                <module>wicket-user-guide</module>
-       </modules>
+        <module>wicket-migration</module>

Review Comment:
   I think it would be good to rename this module (and its Java package) to 
include `9_to_10`. This way it could stay for several major releases and it 
won't collide with the next migration, e.g. `10_to_11`



##########
pom.xml:
##########
@@ -119,7 +119,8 @@
                <module>wicket-native-websocket</module>
                <module>wicket-bean-validation</module>
                <module>wicket-user-guide</module>
-       </modules>
+        <module>wicket-migration</module>

Review Comment:
   Or even better let's introduce an intermediate Maven module for `migration` 
and then all `x_to_y` modules will be children of it.





> Add migration recipes to Wicket 10
> ----------------------------------
>
>                 Key: WICKET-7029
>                 URL: https://issues.apache.org/jira/browse/WICKET-7029
>             Project: Wicket
>          Issue Type: New Feature
>    Affects Versions: 10.0.0
>            Reporter: Tim te Beek
>            Priority: Minor
>              Labels: migration
>
> The [Migration to Wicket 
> 10.0|https://cwiki.apache.org/confluence/display/WICKET/Migration+to+Wicket+10.0]
>  guide contains a number of breaking changes, that users will have to adopt. 
> Examples include merging `wicket-http2` into `wicket-core`, and the 
> associated package change of `PushHeaderItem` to 
> `org.apache.wicket.markup.head.http2`. And while understandably necessary, 
> these nonetheless can be a hurdle for users to adopt.
> To help users adopt Wicket 10 and the associated upgrade to Java 17 and 
> Servlet 5+ I propose to add a module containing [OpenRewrite migration 
> recipes|https://docs.openrewrite.org/]. For those unfamiliar: OpenRewrite 
> allows you to define migration steps either through Yaml or with Java 
> visitors, and compose these steps to achieve larger migrations. Such 
> migrations have been [applied to Wicket 
> before,|https://github.com/apache/wicket/pull/546] but they can also be 
> defined and distributed for Apache Wicket users.
> As a recent example, migration recipes have been [added to Axon 
> Framework|https://developer.axoniq.io/w/upgrading-to-axon-framework-4.7-automated].
>  In practice that comes down to the following code changes, which also 
> include instructions on their use: 
> [https://github.com/AxonFramework/AxonFramework/pull/2597/files]
> Wicket 10 migration recipes can include a number of existing recipes that 
> help modernize applications:
>  # [Use lambdas where 
> possible|https://docs.openrewrite.org/reference/recipes/java/cleanup/uselambdaforfunctionalinterface]
>  # [Migrate to Jakarta EE 
> 9|https://docs.openrewrite.org/reference/recipes/java/migrate/jakarta/javaxmigrationtojakarta]
>  # [Migrate to Java 
> 17|https://docs.openrewrite.org/reference/recipes/java/migrate/upgradetojava17]
> The Wicket 10 specific recipes can reuse common building blocks such as 
> ChangeType to adopt package name changes, and RemoveDependency to remove 
> `wicket-http2`.
> Technically this wouldn't have to be very difficult initially, even more so 
> when the goal is to assist a migration rather than to achieve a complete 
> migration. The Axon Framework migration can serve as a template, and I'm 
> happy to provide guidance.
> Would this be something worth adding to Apache Wicket?



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