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https://issues.apache.org/jira/browse/COLLECTIONS-842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17762182#comment-17762182
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Alex Herbert commented on COLLECTIONS-842:
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Copying the implementation should be simple since AbstractLinkedList does not
have any non-trivial dependencies. That would allow you to continue developing
with JDK 21 until this is resolved.
You may get some more response on possible ways to move this forward if you
post to the [developer mailing list|https://commons.apache.org/mail-lists.html]
using the subject "[collections] ...". There may be some subscribers to that
list who do not see Jira tickets (which go to issues@commons).
I am not averse to duplicating AbstractLinkedList and documenting the reason in
the new and old class javadoc header. Full support would also duplicate
CursorableLinkedList and NodeCachingLinkedList too for completeness.
> 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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