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https://issues.apache.org/jira/browse/KAFKA-8146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16836193#comment-16836193
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Adam Antal commented on KAFKA-8146:
-----------------------------------
Hi,
This error is the same as in HADOOP-10848. This is due to JDK9+ blocking access
to sun.* classes.
Can be resolved with a patch in ZK side by getting rid of the reflective call.
> WARNING: An illegal reflective access operation has occurred
> ------------------------------------------------------------
>
> Key: KAFKA-8146
> URL: https://issues.apache.org/jira/browse/KAFKA-8146
> Project: Kafka
> Issue Type: Bug
> Components: clients, core
> Affects Versions: 2.1.1
> Environment: Java 11
> Kafka v2.1.1
> Reporter: Abhi
> Priority: Major
>
> Hi,
> I am running Kafka v2.1.1 and see below warnings at the startup of server and
> clients. What is the cause of these warnings and how they can be avoided or
> fixed?
> *Client side:*
> WARNING: Illegal reflective access by
> org.apache.kafka.common.network.SaslChannelBuilder
> (file:/local/kafka/kafka_installation/kafka_2.12-2.1.1/libs/kafka-clients-2.1.1.jar)
> to method sun.security.krb5.Config.getInstance()
> WARNING: Please consider reporting this to the maintainers of
> org.apache.kafka.common.network.SaslChannelBuilder
> 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
> *Server side:*
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by
> org.apache.zookeeper.server.util.KerberosUtil
> (file:/local/kafka/kafka_installation/kafka_2.12-2.1.1/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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