Re: ClassNotFoundException with Flink 1.4.1 and Kafka connector

Chesnay Schepler Wed, 28 Feb 2018 05:45:07 -0800

Well we just ended up in ClassLoader hell...

There are 2 config options that could help:


 * add "org.apache.kafka." to "classloader.parent-first-patterns"
     o make sure you include the default as well
       
(|"java.;org.apache.flink.;javax.annotation;org.slf4j;org.apache.log4j;org.apache.logging.log4j;ch.qos.logback")|
 * set "classloader.resolve-order" to "parent-first"


On 28.02.2018 14:28, Debasish Ghosh wrote:

Thanks for the suggestion. I copied the application jar to lib. Theerror doesn't come but I get another error related to Kafka ..
org.apache.kafka.common.KafkaException: Failed to construct kafka producer
atorg.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:433)atorg.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:291)atorg.apache.flink.streaming.connectors.kafka.internal.FlinkKafkaProducer.<init>(FlinkKafkaProducer.java:114)atorg.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.initProducer(FlinkKafkaProducer011.java:949)atorg.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.beginTransaction(FlinkKafkaProducer011.java:681)atorg.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.beginTransaction(FlinkKafkaProducer011.java:93)atorg.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.beginTransactionInternal(TwoPhaseCommitSinkFunction.java:359)atorg.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkFunction.initializeState(TwoPhaseCommitSinkFunction.java:350)atorg.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer011.initializeState(FlinkKafkaProducer011.java:856)atorg.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178)atorg.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160)atorg.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96)atorg.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:258)atorg.apache.flink.streaming.runtime.tasks.StreamTask.initializeOperators(StreamTask.java:694)atorg.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:682)atorg.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:253)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.kafka.common.KafkaException:org.apache.kafka.common.serialization.ByteArraySerializer is not aninstance of org.apache.kafka.common.serialization.Serializeratorg.apache.kafka.common.config.AbstractConfig.getConfiguredInstance(AbstractConfig.java:248)atorg.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:342)
... 17 more

regards.
On Wed, Feb 28, 2018 at 2:31 PM, Chesnay Schepler <ches...@apache.org<mailto:ches...@apache.org>> wrote:
    Hello,

    this is probably caused by a known issue in 1.4.1:
    https://issues.apache.org/jira/browse/FLINK-8741
    <https://issues.apache.org/jira/browse/FLINK-8741>

    This bug is not present in 1.4.0, and it will fixed in 1.4.2 which
    should be released within the next days.

    As a temporary workaround you can copy your app-assembly-1.0.jar
    into the /lib directory.


    On 28.02.2018 08:45, Debasish Ghosh wrote:
    Hi -

    Facing a ClassNotFoundException while running Flink application
    that reads from Kafka. This is a modified version of the NYC Taxi
    App that reads from Kafka.

    I am using Flink 1.4.1 .. The application runs ok with Flink 1.3 ..

    Here's the exception ..

        java.lang.ClassNotFoundException:
        com.lightbend.fdp.sample.flink.app.TaxiRideTSAssigner
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:348)
        at
        
org.apache.flink.util.InstantiationUtil$ClassLoaderObjectInputStream.resolveClass(InstantiationUtil.java:73)
        at
        java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1620)
        at
        java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
        at
        
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1781)
        at
        java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at
        java.io.ObjectInputStream.readObject(ObjectInputStream.java:373)
        at
        
org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:393)
        at
        
org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:380)
        at
        
org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:368)
        at
        
org.apache.flink.util.SerializedValue.deserializeValue(SerializedValue.java:58)
        at
        
org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher.createPartitionStateHolders(AbstractFetcher.java:521)
        at
        
org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher.<init>(AbstractFetcher.java:167)
        at
        
org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.<init>(Kafka09Fetcher.java:89)
        at
        
org.apache.flink.streaming.connectors.kafka.internal.Kafka010Fetcher.<init>(Kafka010Fetcher.java:62)
        at
        
org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer010.createFetcher(FlinkKafkaConsumer010.java:203)
        at
        
org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:564)
        at
        
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:86)
        at
        
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:55)
        at
        
org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:94)
        at
        
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:264)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:718)
        at java.lang.Thread.run(Thread.java:745)


    I run the application as follows ..

        $ ./bin/flink run
        
/Users/debasishghosh/flink/source/core/app/target/scala-2.11/app-assembly-1.0.jar
        --broker-list localhost:9092 --inTopic taxiin --outTopic taxiout


    I verified that the jar contains the class ..

        $ jar tvf app-assembly-1.0.jar | grep TaxiRideTSAssigner
          2090 Wed Feb 28 12:59:52 IST 2018
        com/lightbend/fdp/sample/flink/app/TaxiRideTSAssigner.class



    Here are the relevant dependencies in build ..

    val flinkScala            = "org.apache.flink"             %%
     "flink-scala"                    % "1.4.1" % "provided"
    val flinkStreamingScala   = "org.apache.flink"             %%
     "flink-streaming-scala"          % "1.4.1" % "provided"
    val flinkKafka            = "org.apache.flink"             %%
     "flink-connector-kafka-0.11"     % "1.4.1" exclude("org.slf4j",
    "slf4j-log4j12")


    any help ?

    regards.
--Debasish Ghosh
    http://manning.com/ghosh2
    http://manning.com/ghosh

    Twttr: @debasishg
    Blog: http://debasishg.blogspot.com
    Code: http://github.com/debasishg
--
Debasish Ghosh
http://manning.com/ghosh2
http://manning.com/ghosh

Twttr: @debasishg
Blog: http://debasishg.blogspot.com
Code: http://github.com/debasishg

Re: ClassNotFoundException with Flink 1.4.1 and Kafka connector

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