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https://issues.apache.org/jira/browse/FLINK-16262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17046592#comment-17046592
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Gary Yao commented on FLINK-16262:
----------------------------------
[~pnowojski] In 1.10 we enabled user code class loading for per-job clusters.
Before the job jar was just added to the classpath.
> Class loader problem with FlinkKafkaProducer.Semantic.EXACTLY_ONCE and usrlib
> directory
> ---------------------------------------------------------------------------------------
>
> Key: FLINK-16262
> URL: https://issues.apache.org/jira/browse/FLINK-16262
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka, Deployment / Docker
> Affects Versions: 1.10.0
> Environment: openjdk:11-jre with a slightly modified Flink 1.10.0
> build (nothing changed regarding Kafka and/or class loading).
> Reporter: Jürgen Kreileder
> Priority: Blocker
> Fix For: 1.10.1, 1.11.0
>
>
> We're using Docker images modeled after
> [https://github.com/apache/flink/blob/master/flink-container/docker/Dockerfile]
> (using Java 11)
> When I try to switch a Kafka producer from AT_LEAST_ONCE to EXACTLY_ONCE, the
> taskmanager startup fails with:
> {code:java}
> 2020-02-24 18:25:16.389 INFO o.a.f.r.t.Task Create
> Case Fixer -> Sink: Findings local-krei04-kba-digitalweb-uc1 (1/1)
> (72f7764c6f6c614e5355562ed3d27209) switched from RUNNING to FAILED.
> org.apache.kafka.common.config.ConfigException: Invalid value
> org.apache.kafka.common.serialization.ByteArraySerializer for configuration
> key.serializer: Class
> org.apache.kafka.common.serialization.ByteArraySerializer could not be found.
> at org.apache.kafka.common.config.ConfigDef.parseType(ConfigDef.java:718)
> at org.apache.kafka.common.config.ConfigDef.parseValue(ConfigDef.java:471)
> at org.apache.kafka.common.config.ConfigDef.parse(ConfigDef.java:464)
> at
> org.apache.kafka.common.config.AbstractConfig.<init>(AbstractConfig.java:62)
> at
> org.apache.kafka.common.config.AbstractConfig.<init>(AbstractConfig.java:75)
> at
> org.apache.kafka.clients.producer.ProducerConfig.<init>(ProducerConfig.java:396)
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:326)
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:298)
> at
> org.apache.flink.streaming.connectors.kafka.internal.FlinkKafkaInternalProducer.<init>(FlinkKafkaInternalProducer.java:76)
> at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer.lambda$abortTransactions$2(FlinkKafkaProducer.java:1107)
> at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown
> Source)
> at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(Unknown
> Source)
> at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source)
> at java.base/java.util.stream.ForEachOps$ForEachTask.compute(Unknown Source)
> at java.base/java.util.concurrent.CountedCompleter.exec(Unknown Source)
> at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
> at
> java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown
> Source)
> at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
> at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
> at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown
> Source){code}
> This looks like a class loading issue: If I copy our JAR to FLINK_LIB_DIR
> instead of FLINK_USR_LIB_DIR, everything works fine.
> (AT_LEAST_ONCE producers works fine with the JAR in FLINK_USR_LIB_DIR)
>
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