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https://issues.apache.org/jira/browse/CASSANDRA-9608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558714#comment-16558714
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Benedict commented on CASSANDRA-9608:
-------------------------------------

OK, that seems a shame though, and may result in two tickets - one to do the 
trivial (i.e. precisely 3 line) optimisation, and another to do the meaningful 
optimisation, that may not realistically make it into 4.0 - depending on how 
strictly we consider this a performance regression (probably it is borderline, 
and will require strong justification if we do not complete it before feature 
freeze).

> Support Java 11
> ---------------
>
>                 Key: CASSANDRA-9608
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9608
>             Project: Cassandra
>          Issue Type: Task
>            Reporter: Robert Stupp
>            Assignee: Robert Stupp
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: jdk_9_10.patch
>
>
> This ticket is intended to group all issues found to support Java 9 in the 
> future.
> From what I've found out so far:
> * Maven dependency {{com.sun:tools:jar:0}} via cobertura cannot be resolved. 
> It can be easily solved using this patch:
> {code}
> -        <dependency groupId="net.sourceforge.cobertura" 
> artifactId="cobertura"/>
> +        <dependency groupId="net.sourceforge.cobertura" 
> artifactId="cobertura">
> +          <exclusion groupId="com.sun" artifactId="tools"/>
> +        </dependency>
> {code}
> * Another issue is that {{sun.misc.Unsafe}} no longer contains the methods 
> {{monitorEnter}} + {{monitorExit}}. These methods are used by 
> {{o.a.c.utils.concurrent.Locks}} which is only used by 
> {{o.a.c.db.AtomicBTreeColumns}}.
> I don't mind to start working on this yet since Java 9 is in a too early 
> development phase.



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