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https://issues.apache.org/jira/browse/ZOOKEEPER-3779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17212158#comment-17212158
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Mate Szalay-Beko commented on ZOOKEEPER-3779:
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[~jaikiran] thanks for raising this issue and thanks for the explanation!
ZooKeeper 3.4 is not supported anymore by the community, no new 3.4 release is
expected. If this error is not on the newer ZooKeeper versions, then we can
consider this as (yet an other) reason for every user to upgrade to the latest
3.5 or 3.6 versions.
> Zookeeper client 3.4.x fails to connect when using Java 14
> ----------------------------------------------------------
>
> Key: ZOOKEEPER-3779
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3779
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.4.14
> Environment: Java 14
> Reporter: Jaikiran Pai
> Priority: Major
>
> When running on Java 14, the 3.4.x version of
> `org.apache.zookeeper.Zookeeper` which creates a client to connect to a
> Zookeeper server, fails to connect against the server.
> This appears to be due to the use of `InetSocketAddress.toString()` to parse
> the host name of an unresolved address in StaticHostProvider[1]. The issue
> doesn't show up in 3.5.x versions of Zookeeper. But given that 3.4.x isn't
> that old, I thought I'll raise this here and see if it can be fixed and
> whether a new 3.4.x release is warranted.
> Furthermore, there was a discussion here[2] which explains the whole details.
> There's even a discussion in the openjdk net-dev mailing list[3] to see if
> there are other similar usages in Zookeeper which might be impacted by this
> change in the JDK 14. I don't have any real experience with this library, so
> if someone more knowledgable knows whether or not there are other similar
> usages in this project, please do reply to the net-dev discussion on the
> openjdk mailing list.
>
> [1]
> [https://github.com/apache/zookeeper/blob/branch-3.4.14/zookeeper-server/src/main/java/org/apache/zookeeper/client/StaticHostProvider.java#L135]
> [2] [https://github.com/quarkusio/quarkus/issues/8212#issuecomment-605403656]
> [3] https://mail.openjdk.java.net/pipermail/net-dev/2020-March/013725.html
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