[jira] [Assigned] (ZOOKEEPER-3215) Handle Java 9/11 additions of covariant return types to java.nio.ByteBuffer methods

["Mate Szalay-Beko (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-3215?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mate Szalay-Beko reassigned ZOOKEEPER-3215:
-------------------------------------------

    Assignee: Andor Molnar

> Handle Java 9/11 additions of covariant return types to java.nio.ByteBuffer methods
> -----------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-3215
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3215
>             Project: ZooKeeper
>          Issue Type: Bug
>    Affects Versions: 3.4.13
>            Reporter: V
>            Assignee: Andor Molnar
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> Java 9 introduces covariant return types which allows one to have different return types if return type in the overridden method is a sub type. Since Java 9, few functions return ByteBuffer, whereas the parent method return Buffer, resulting in causing issues for Java 8 and below since for them the method does not exist.
> Steps To Reproduce:
> 1. Setup ZooKeeper Server with JDK11.
> 2. Setup ZooKeeper Client with JDK8.
> 3. Try connecting the client and server.
> Results:
> Cast ByteBuffer instances to Buffer before calling the method.
>  
> Notes:
> There was a similar bug in the MongoDB community - [https://jira.mongodb.org/browse/JAVA-2559]
>  
> This is not a contribution.



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