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https://issues.apache.org/jira/browse/ZOOKEEPER-3215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17092754#comment-17092754
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Sean Busbey commented on ZOOKEEPER-3215:
----------------------------------------
I hit this issue when trying to use Zookeeper 3.5.7 installed via Homebrew.
The logs (after adjusting the log level in
{{/usr/local/etc/zookeeper/log4j.properties}} from WARN to INFO) contain the
tell-tale complaint:
{code}
2020-04-25 02:42:15 NIOServerCnxn [WARN] Unable to read additional data from
client sessionid 0x0, likely client has closed socket
2020-04-25 02:42:16 ClientCnxn [INFO] Opening socket connection to server
localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown
error)
2020-04-25 02:42:16 ClientCnxn [WARN] Session 0x0 for server
localhost/127.0.0.1:2181, unexpected error, closing socket connection and
attempting reconnect
java.lang.NoSuchMethodError: java.nio.ByteBuffer.clear()Ljava/nio/ByteBuffer;
at
org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:296)
at
org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1104)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1139)
2020-04-25 02:42:16 NIOServerCnxn [WARN] Unable to read additional data from
client sessionid 0x0, likely client has closed socket
2020-04-25 02:42:16 ZooKeeper [INFO] Session: 0x0 closed
2020-04-25 02:42:16 ClientCnxn [INFO] EventThread shut down for session: 0x0
{code}
My JAVA_HOME is set to jdk8 build 161, as is the bare "javac" command
{code}
echo $busbey-mba13:~ busbey$ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk1.8.0_161.jdk/Contents/Home/
busbey-mba13:~ busbey$ which javac
/usr/bin/javac
busbey-mba13:~ busbey$ /usr/bin/javac -version
javac 1.8.0_161
{code}
I do have other Javas installed
{code}
busbey-mba13:~ busbey$ ls /Library/Java/JavaVirtualMachines/
jdk-9.jdk jdk1.8.0_161.jdk jdk1.8.0_74.jdk
jdk8u172-b11 zulu-7.jdk
jdk1.7.0_80.jdk jdk1.8.0_192.jdk jdk1.9-ea-b102.jdk
openjdk-11.0.2.jdk
{code}
I'm checking to see now if homebrew installed from source and if so how it
picked which JDK to compile with.
> 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
> 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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