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https://issues.apache.org/jira/browse/CASSANDRA-9608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16552956#comment-16552956
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Jason Brown commented on CASSANDRA-9608:
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bq. The best compromise of approaches here is probably the ReentrantLock 
approach, as it is simplest and has the best behavioural profile, with the only 
cost being a modest increase in heap for contended objects (which are typically 
heavy already, else the chance of contention is low)

I agree. And thanks for your input here, [~benedict]. I appreciate having 
another PoV on this subject.

[~snazy] I've been [running this branch on 
circleci|https://circleci.com/gh/jasobrown/workflows/cassandra/tree/9608-circleci],
 and the dtests have lot of failures (~120 or so). Can you take a look? Not 
sure if it's an environmental problem or what (haven't had a chance to dig in 
yet).

> 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.x
>
>         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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