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https://issues.apache.org/jira/browse/ZOOKEEPER-3263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16836183#comment-16836183
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Adam Antal commented on ZOOKEEPER-3263:
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It looks quite similar to HADOOP-10848.
This is due to JDK9+ blocking accesses to sun.* classes. You can find more
information in that case.
Also, it's probably need a patch from ZK side to remove this though.
> Illegal reflective access in zookeer's kerberosUtil
> ---------------------------------------------------
>
> Key: ZOOKEEPER-3263
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3263
> Project: ZooKeeper
> Issue Type: Improvement
> Reporter: Pradeep Bansal
> Priority: Major
>
> I am using kafka 2.11-2.1.0 with Java 11. Kafka is using zookeeper-3.4.13.jar
> and when am running kafka-acl script to maange ACLs, I am getting below
> warning. Is there a way to resolve this?
> {{WARNING: An illegal reflective access operation has occurred WARNING:
> Illegal reflective access by org.apache.zookeeper.server.util.KerberosUtil
> (file://apache/kafka/kafka_2.11-2.1.0/libs/zookeeper-3.4.13.jar) to method
> sun.security.krb5.Config.getInstance() WARNING: Please consider reporting
> this to the maintainers of org.apache.zookeeper.server.util.KerberosUtil
> WARNING: Use --illegal-access=warn to enable warnings of further illegal
> reflective access operations WARNING: All illegal access operations will be
> denied in a future release}}
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