[jira] [Created] (FLINK-16262) Class loader problem with FlinkKafkaProducer.Semantic.EXACTLY_ONCE and usrlib directory

[Shang Yuanchun (Jira)]

Jürgen Kreileder created FLINK-16262:
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             Summary: 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
    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


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}
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 class loading issue: If I copy our JAR to FLINK_LIB_DIR instead of FLINK_USR_LIB_DIR, everything works find.

(AT_LEAST_ONCE producers works fine with the JAR in FLINK_USR_LIB_DIR)

 



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