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https://issues.apache.org/jira/browse/COLLECTIONS-842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763075#comment-17763075
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Julian Reschke commented on COLLECTIONS-842:
--------------------------------------------
FWIW, everything that will cause problems under Java 21 should be marked
deprecated, even if there's no replacement.
> AbstractLinkedList apparently incompatible with JDK 21's java.util.List
> -----------------------------------------------------------------------
>
> Key: COLLECTIONS-842
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-842
> Project: Commons Collections
> Issue Type: Bug
> Components: List
> Reporter: Julian Reschke
> Priority: Major
>
> ...it returns "boolean" in commons-collections4, but is void in JDK 21 (see
> https://download.java.net/java/early_access/jdk21/docs/api/java.base/java/util/List.html#addLast(E))
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