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https://issues.apache.org/jira/browse/WICKET-6836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17205568#comment-17205568
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Martin Tzvetanov Grigorov commented on WICKET-6836:
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You can use the mailing lists for questions! ;)
The dependency is marked as optional at
[https://github.com/apache/wicket/blob/6b6d6491362d45df9c1b66a2693ccab2be964be7/pom.xml#L651]
(the parent pom). So your app won't depend on it automatically.
wicket-util needs it for WicketTester.
> Replace CGLib with ByteBuddy and/or Javassist
> ---------------------------------------------
>
> Key: WICKET-6836
> URL: https://issues.apache.org/jira/browse/WICKET-6836
> Project: Wicket
> Issue Type: Improvement
> Components: wicket-ioc
> Affects Versions: 9.0.0
> Environment: Linux
> Reporter: Gert-Jan Schouten
> Priority: Minor
>
> When trying to run Wicket 9.0.0 under Java 15, it fails with an "Unsupported
> class file major version 59" error from CGLib.
> [This issue|https://github.com/cglib/cglib/issues/74] suggests that CGLib is
> not actively maintained anymore. The Maven Central hasn't seen a new version
> since August 2019.
> To make sure Wicket keeps running on the latest Java version, a migration to
> ByteBuddy and/or Javassist is recommended.
> This is especially relevant since Oracle now only supports the latest version
> of OpenJDK, requiring OpenJDK users to switch to the latest version every 6
> months.
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