Develop Reference

Flink Application throw Class Not Found Exception in Java

I have a Flink Cluster with Yarn, use the flink-quickstart-java Archetype to build a demo project. After building a fat-jar with 'mvn clean package -Pbuild-jar' command, and submit the program with 'flink run -m yarn-cluster -yn 2 ./flink-SNAPSHOT-1.0.jar', the program throw the following exception:
java.lang.NoClassDefFoundError:
java.lang.NoClassDefFoundError: org/apache/kafka/common/serialization/ByteArrayDeserializer
at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer09.setDeserializer(FlinkKafkaConsumer09.java:290)
at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer09.(FlinkKafkaConsumer09.java:216)
at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer09.(FlinkKafkaConsumer09.java:154)
at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer010.(FlinkKafkaConsumer010.java:128)
at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer010.(FlinkKafkaConsumer010.java:112)
at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer010.(FlinkKafkaConsumer010.java:79)
at stream.TransferKafka.main(TransferKafka.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:525)
at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:417)
at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:395)
at org.apache.flink.client.CliFrontend.executeProgram(CliFrontend.java:828)
at org.apache.flink.client.CliFrontend.run(CliFrontend.java:283)
at org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1080)
at org.apache.flink.client.CliFrontend$1.call(CliFrontend.java:1127)
at org.apache.flink.client.CliFrontend$1.call(CliFrontend.java:1124)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1781)
at org.apache.flink.runtime.security.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1124)
Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.serialization.ByteArrayDeserializer
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 24 more
And Here is my demo:
public static void main(String[] args) {
final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
Properties props = new Properties();
props.setProperty("bootstrap.servers", "ip:port");
props.setProperty("group.id", "NewFlinkTest");
DataStreamSource < String > stream = env.addSource(new FlinkKafkaConsumer010 < > ("kafka_test", new SimpleStringSchema(), props));
stream.addSink(new FlinkKafkaProducer010 < > ("kafka_test_out", new SimpleStringSchema(), props));
try {
env.execute("Flink Jar Test");
} catch (Exception e) {
e.printStackTrace();
}
}
And some version information:
FLink Version: 1.4.0
Hadoop Version: 2.7.2
Kafka Version: 0.10.2.1
JDK Version: 1.8
Pom dependencies
Edit1:
<?xml version="1.0" encoding="UTF-8"?>
<dependencies>
<!-- Apache Flink dependencies -->
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-core</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-java</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<!-- This dependency is required to actually execute jobs. It is currently pulled in by flink-streaming-java, but we explicitly depend on it to safeguard against future changes. -->
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients_${scala.binary.version}</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-java_${scala.binary.version}</artifactId>
<version>${flink.version}</version>
</dependency>
<!-- explicitly add a standard logging framework, as Flink does not have a hard dependency on one specific framework by default -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-rabbitmq_2.11</artifactId>
<version>1.4.0</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-kafka-0.10_${scala.binary.version}</artifactId>
<version>1.4.0</version>
</dependency>
</dependencies>
After some attempts, I find the code throws exception is not the same jar that I packed into my uber-jar. I think the main reason is the client server has older version of the flink-connector-kafka jar, but no matter how I set the config yaml property 'yarn.per-job-cluster.include-user-jar', the program always throws the same exception.
Edit2:
After add kafka-clients:0.10.2.1 to flink_home/lib/, it works. But still don't know the reason why it doesn't read class file in uber jar.

First, you may verify if the missing class is in your jar file by grep 'ByteArrayDeserializer' ./flink-SNAPSHOT-1.0.jar.

You probably want to add <scope>provided</scope> to flink-streaming-scala, flink-clients, link-table-api-scala-bridge and flink-table-planner-blink - that solves my problem

Unable to connect to HBase table using Java

I am trying to connect to Hbase (version: 1.2.0) deployed on a different machine. I am using Eclipse and below is the code that I have written:
HTable table = null;
Configuration configuration = HBaseConfiguration.create();
configuration.set("hbase.zookeeper.quorum", "192.168.0.191");
configuration.set("hbase.zookeeper.property.clientPort", "2181");
FilterList list = new FilterList(FilterList.Operator.MUST_PASS_ALL);
table = new HTable(configuration, hbaseTable);
Below are the dependencies I have added in pom.xml:
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-core</artifactId>
<version>1.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
On running the code, I am getting the below exception:
Exception in thread "main" java.lang.NoSuchMethodError: org.apache.hadoop.conf.Configuration.addDeprecations([Lorg/apache/hadoop/conf/Configuration$DeprecationDelta;)V
at org.apache.hadoop.mapreduce.util.ConfigUtil.addDeprecatedKeys(ConfigUtil.java:54)
at org.apache.hadoop.mapreduce.util.ConfigUtil.loadResources(ConfigUtil.java:42)
at org.apache.hadoop.mapred.JobConf.<clinit>(JobConf.java:119)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:810)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:80)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.security.Groups.<init>(Groups.java:48)
at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:140)
at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:134)
at org.apache.hadoop.hbase.security.UserProvider.<clinit>(UserProvider.java:56)
at org.apache.hadoop.hbase.client.HConnectionKey.<init>(HConnectionKey.java:71)
at org.apache.hadoop.hbase.client.ConnectionManager.getConnectionInternal(ConnectionManager.java:298)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:184)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:150)
at HbaseConnection.createConnection(HbaseConnection.java:34)
at HbaseConnection.main(HbaseConnection.java:22)
I have gone through various links related to similar problem but I could not find any working solution. Can somebody help with the issue in my configuration or in my code?

deeplearning4j on yarn cluster fails

I want to submit my jar on cluster using master=yarn-cluster , but get error.
java.lang.NoClassDefFoundError: org/nd4j/Nd4jRegistrator
at Main.main(Main.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.deploy.yarn.ApplicationMaster$$anon$2.run(ApplicationMaster.scala:552)
Caused by: java.lang.ClassNotFoundException: org.nd4j.Nd4jRegistrator
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
I set sparkConf like this, using krio serializer, because i had exceptions when i run without it
SparkConf sparkConf = new SparkConf().setMaster(master).setAppName("DL4J Spark Example");
sparkConf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer");
sparkConf.set("spark.kryo.registrator", "org.nd4j.Nd4jRegistrator");
JavaSparkContext sc = new JavaSparkContext(sparkConf);
dependencies in pom file:
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>1.6.0</version>
</dependency>
<dependency>
<groupId>org.deeplearning4j</groupId>
<artifactId>deeplearning4j-core</artifactId>
<version>0.8.0</version>
</dependency>
<dependency>
<groupId>org.deeplearning4j</groupId>
<artifactId>dl4j-spark_2.10</artifactId>
<version>0.8.0_spark_1</version>
</dependency>
<dependency>
<groupId>org.nd4j</groupId>
<artifactId>nd4j-native-platform</artifactId>
<version>0.8.0</version>
</dependency>
<dependency>
<groupId>org.nd4j</groupId>
<artifactId>nd4j-kryo_2.10</artifactId>
<version>0.8.0</version>
</dependency>
<dependency>
<groupId>com.esotericsoftware</groupId>
<artifactId>kryo</artifactId>
<version>4.0.0</version>
</dependency>
</dependencies>
it can't find Nd4jRegistrator class, but why?
When i run local this works correctly.

I'm guessing you didn't setup your uberjar correctly? You need to make sure to bundle everything. Your pom looks ok overall.

Spark kafka streaming - java.lang.NoClassDefFoundError: akka/util/Helpers$ConfigOps$

I am writing a spark application written in Scala that listens to a Kafka topic. The application just prints out the message received that's all. I am running this locally on my machine...
......
import org.apache.spark.SparkConf
import org.apache.spark.sql.SQLContext
import org.apache.spark.streaming.kafka.KafkaUtils
import org.apache.spark.streaming.{Seconds, StreamingContext}
.....
val topics = "topicName";//args(2)
val numThreads = 1;
val zkQuorum = "zookeeper quorum"
val group = "groupName"
//val inputTable = args(5)
// Set application name (when we run this on the cluster this is what will appear in the spark UI)
val sparkConf = new SparkConf().setAppName("appName").setMaster("local")
// On what topics shall I listen? Create an array of topics to pass to the stream configurations...
val topicMap = topics.split(",").map((_, numThreads.toInt)).toMap
// Will poll every X seconds
val ssc = new StreamingContext(sparkConf, Seconds(15))
// Create stream (has not been triggered yet)
val stream = KafkaUtils.createStream(ssc, zkQuorum, group, topicMap).map(_._2)
// For each stream!
stream.foreachRDD { rdd =>
// Check if empty...
if (rdd.toLocalIterator.nonEmpty)
{
// Create SQL Context out of the streaming
val sqlContext = new SQLContext(ssc.sparkContext)
// Register temporary table out of the recieved
sqlContext.read.json(rdd).registerTempTable("resultRecieved")
// Create SQL Context, and you can filter
val result = sqlContext.sql(
"select * FROM resultRecieved")
if(result.count() == 0 )
println("No results!")
else{
println(result.count() + " Results!")
}
}
}
// Print stream
stream.print
// Trigger!
ssc.start()
// Await stopping of the service...
ssc.awaitTermination()
I am using Scala 2.10.4, and here is my maven configuration
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>1.5.2</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.10</artifactId>
<version>0.8.2.1</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.10</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>1.5.1</version>
</dependency>
<dependency>
<groupId>com.typesafe</groupId>
<artifactId>config</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming-kafka_2.10</artifactId>
<version>0.9.0-incubating</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.10</artifactId>
<version>${spark.version}</version>
</dependency>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-swing</artifactId>
<version>2.10.4</version>
</dependency>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.10.1</version>
</dependency>
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-actor_2.10</artifactId>
<version>2.2.1</version>
</dependency>
</dependencies>
With scala.version being 2.10.1, and spark.version being 1.5.1.
I am getting
Exception in thread "main" java.lang.NoClassDefFoundError: akka/util/Helpers$ConfigOps$
at akka.remote.RemoteSettings.<init>(RemoteSettings.scala:49)
at akka.remote.RemoteActorRefProvider.<init>(RemoteActorRefProvider.scala:114)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at akka.actor.ReflectiveDynamicAccess$$anonfun$createInstanceFor$2.apply(DynamicAccess.scala:78)
at scala.util.Try$.apply(Try.scala:161)
at akka.actor.ReflectiveDynamicAccess.createInstanceFor(DynamicAccess.scala:73)
at akka.actor.ReflectiveDynamicAccess$$anonfun$createInstanceFor$3.apply(DynamicAccess.scala:84)
at akka.actor.ReflectiveDynamicAccess$$anonfun$createInstanceFor$3.apply(DynamicAccess.scala:84)
at scala.util.Success.flatMap(Try.scala:200)
at akka.actor.ReflectiveDynamicAccess.createInstanceFor(DynamicAccess.scala:84)
at akka.actor.ActorSystemImpl.<init>(ActorSystem.scala:550)
at akka.actor.ActorSystem$.apply(ActorSystem.scala:111)
at akka.actor.ActorSystem$.apply(ActorSystem.scala:104)
at org.apache.spark.util.AkkaUtils$.org$apache$spark$util$AkkaUtils$$doCreateActorSystem(AkkaUtils.scala:121)
at org.apache.spark.util.AkkaUtils$$anonfun$1.apply(AkkaUtils.scala:53)
at org.apache.spark.util.AkkaUtils$$anonfun$1.apply(AkkaUtils.scala:52)
at org.apache.spark.util.Utils$$anonfun$startServiceOnPort$1.apply$mcVI$sp(Utils.scala:1913)
at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:141)
at org.apache.spark.util.Utils$.startServiceOnPort(Utils.scala:1904)
at org.apache.spark.util.AkkaUtils$.createActorSystem(AkkaUtils.scala:55)
at org.apache.spark.rpc.akka.AkkaRpcEnvFactory.create(AkkaRpcEnv.scala:253)
at org.apache.spark.rpc.RpcEnv$.create(RpcEnv.scala:53)
at org.apache.spark.SparkEnv$.create(SparkEnv.scala:252)
at org.apache.spark.SparkEnv$.createDriverEnv(SparkEnv.scala:193)
at org.apache.spark.SparkContext.createSparkEnv(SparkContext.scala:277)
at org.apache.spark.SparkContext.<init>(SparkContext.scala:450)
at org.apache.spark.streaming.StreamingContext$.createNewSparkContext(StreamingContext.scala:549)
at org.apache.spark.streaming.StreamingContext.<init>(StreamingContext.scala:75)
at SIVConsumer$.main(SIVConsumer.scala:33)
at SIVConsumer.main(SIVConsumer.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: java.lang.ClassNotFoundException: akka.util.Helpers$ConfigOps$
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)
... 38 more
Process finished with exit code 1
Any idea which dependencies aren't getting along well together? I have tried using the latest Scala binaries but it still fails.

I guess the problem is with spark-streaming version. It should be same as spark-core (1.5.2). Same for spark-streaming-kafka_2.10.
You can refer a working pom.xml from my sample project https://github.com/atulsm/Test_Projects/blob/master/pom.xml

The issue was incorrect versions of spark-streaming. For others, the following dependency list in maven allows
Listen to a kafka topic
Create a spark stream
Write to an hbase table
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.10.4</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>1.4.1</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.10</artifactId>
<version>1.4.1</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming-kafka_2.10</artifactId>
<version>1.4.1</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.10</artifactId>
<version>0.8.2.2</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20150729</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-common</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-server</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.8.3</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.8.3</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.10</artifactId>
<version>1.4.1</version>
</dependency>

Kafka Quickstart: What Dependencies do I need?

I am working through the kafka quickstart:
http://kafka.apache.org/07/quickstart.html
and the basic Consumer Group example:
https://cwiki.apache.org/confluence/display/KAFKA/Consumer+Group+Example
I have coded up the Consumer and ConsumerThreadPool as above:
import kafka.consumer.KafkaStream;
import kafka.consumer.ConsumerIterator;
public class Consumer implements Runnable {
private KafkaStream m_stream;
private Integer m_threadNumber;
public Consumer(KafkaStream a_stream, Integer a_threadNumber) {
m_threadNumber = a_threadNumber;
m_stream = a_stream;
}
public void run() {
ConsumerIterator<byte[], byte[]> it = m_stream.iterator();
while (it.hasNext()) {
System.out.println("Thread " + m_threadNumber + ": " + new String(it.next().message()));
}
System.out.println("Shutting down Thread: " + m_threadNumber);
}
}
A couple of other facets: I am using spring to manage my zookeeper:
import javax.inject.Named;
import java.util.Properties;
import kafka.consumer.ConsumerConfig;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
#Configuration
#ComponentScan("com.truecar.inventory.worker.core")
public class AppConfig {
#Bean
#Named("consumerConfig")
private static ConsumerConfig createConsumerConfig() {
String zookeeperAddress = "127.0.0.1:2181";
String groupId = "inventory";
Properties props = new Properties();
props.put("zookeeper.connect", zookeeperAddress);
props.put("group.id", groupId);
props.put("zookeeper.session.timeout.ms", "400");
props.put("zookeeper.sync.time.ms", "200");
props.put("auto.commit.interval.ms", "1000");
return new ConsumerConfig(props);
}
}
And I am compiling with Maven and the OneJar Maven plugin. However, I compile and then run the resulting one jar I get the following error:
Aug 26, 2013 6:15:41 PM org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider registerDefaultFilters
INFO: JSR-330 'javax.inject.Named' annotation found and supported for component scanning
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.simontuffs.onejar.Boot.run(Boot.java:340)
at com.simontuffs.onejar.Boot.main(Boot.java:166)
Caused by: java.lang.NoClassDefFoundError: scala/ScalaObject
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
at com.simontuffs.onejar.JarClassLoader.defineClass(JarClassLoader.java:803)
at com.simontuffs.onejar.JarClassLoader.findClass(JarClassLoader.java:710)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at com.simontuffs.onejar.JarClassLoader.loadClass(JarClassLoader.java:630)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2521)
at java.lang.Class.getDeclaredMethods(Class.java:1845)
at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:180)
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:222)
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:165)
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:140)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:282)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:223)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:630)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)
at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:73)
at com.truecar.inventory.worker.core.consumer.ConsumerThreadPool.<clinit>(ConsumerThreadPool.java:31)
at com.truecar.inventory.worker.core.application.Starter.main(Starter.java:20)
... 6 more
Caused by: java.lang.ClassNotFoundException: scala.ScalaObject
at com.simontuffs.onejar.JarClassLoader.findClass(JarClassLoader.java:713)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at com.simontuffs.onejar.JarClassLoader.loadClass(JarClassLoader.java:630)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 27 more
Now, I know little about Kafka, and nothing about Scala. How do I fix this? What should i try next? Is this a known issue? Do I need other dependencies? Here is the kafka version in my pom.xml:
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.9.2</artifactId>
<version>0.8.0-beta1</version>
</dependency>
Update: I contacted the Kafka dev mailing list, and they let me know some specific version requirements for the scala dependencies. However, there is also an undocumented log4j dependency, which results in another runtime, not compile time, exception.
Exception in thread "main" java.lang.reflect.InvocationTargetException
Caused by: java.lang.NoSuchMethodError: ch.qos.logback.classic.Logger.filterAndLog(Ljava/lang/String;Lorg/slf4j/Marker;Lch/qos/logback/classic/Level;Ljava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V
at org.apache.log4j.Category.log(Category.java:333)
at org.apache.commons.logging.impl.Log4JLogger.debug(Log4JLogger.java:177)
Another Update:
I found the correct log4j dependency:
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
But now I am met with an even more cryptic runtime exception:
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.simontuffs.onejar.Boot.run(Boot.java:340)
at com.simontuffs.onejar.Boot.main(Boot.java:166)
Caused by: java.lang.NoClassDefFoundError: org/I0Itec/zkclient/IZkStateListener
at kafka.javaapi.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:64)
at kafka.javaapi.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:66)
at kafka.consumer.Consumer$.createJavaConsumerConnector(ConsumerConnector.scala:100)
at kafka.consumer.Consumer.createJavaConsumerConnector(ConsumerConnector.scala)
At this point I got the WTF kind of feeling. So I added another dependency:
<dependency>
<groupId>com.101tec</groupId>
<artifactId>zkclient</artifactId>
<version>0.3</version>
</dependency>
But this exposed yet another runtime exception:
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.simontuffs.onejar.Boot.run(Boot.java:340)
at com.simontuffs.onejar.Boot.main(Boot.java:166)
Caused by: java.lang.NoClassDefFoundError: com/yammer/metrics/core/Gauge
at kafka.consumer.ZookeeperConsumerConnector.createFetcher(ZookeeperConsumerConnector.scala:146)
at kafka.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:113)
at kafka.javaapi.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:64)
at kafka.javaapi.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:66)
at kafka.consumer.Consumer$.createJavaConsumerConnector(ConsumerConnector.scala:100)
at kafka.consumer.Consumer.createJavaConsumerConnector(ConsumerConnector.scala)
I am hoping to be able to get this baby example up and running, but maybe this is the price to pay for using beta products? Maybe I should switch to Apache Active MQ. But that sounds less fun. Am I missing something?

The problem is that kafka beta was built in a way that pom generated with a jar isn't valid and maven could not recognize it and parse properly, thus fetching transitive dependencies. We've managed to mitigate this problem by enlisting all of the dependencies from that pom (scala, zk, etc) in our pom definition. We're waiting for next beta builds of kafka, in which problem will be fixed.
Full dependencies list is below. Note that you have to change scala version dependency accordingly to the postfix of your kafka artifact.
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version>
<exclusions>
<exclusion>
<groupId>com.sun.jmx</groupId>
<artifactId>jmxri</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jdmk</groupId>
<artifactId>jmxtools</artifactId>
</exclusion>
<exclusion>
<groupId>javax.jms</groupId>
<artifactId>jms</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>net.sf.jopt-simple</groupId>
<artifactId>jopt-simple</artifactId>
<version>3.2</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.6.4</version>
</dependency>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-compiler</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>com.101tec</groupId>
<artifactId>zkclient</artifactId>
<version>0.3</version>
</dependency>
<dependency>
<groupId>com.yammer.metrics</groupId>
<artifactId>metrics-core</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>com.yammer.metrics</groupId>
<artifactId>metrics-annotation</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>org.easymock</groupId>
<artifactId>easymock</artifactId>
<version>3.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest</artifactId>
<version>1.2</version>
<scope>test</scope>
</dependency>
As for the
Maybe I should switch to Apache Active MQ. But that sounds less fun.
Am I missing something?
Well, don't you forget that this is the beta release? Some bad things are happening, indeed, but currently we're running kafka 0.7 without any efforts.

I found this configuration of dependencies to be functional:
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.9.2</artifactId>
<version>0.8.0-beta1</version>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>com.101tec</groupId>
<artifactId>zkclient</artifactId>
<version>0.3</version>
</dependency>
<dependency>
<groupId>com.yammer.metrics</groupId>
<artifactId>metrics-core</artifactId>
<version>2.2.0</version>
</dependency>
</dependencies>

This seems to work :
$ git clone https://github.com/buildlackey/cep
$ cd cep/kafka-0.8.x
$ mvn package
$ mvn exec:java -Dexec.mainClass=TestKafkaProducer
(via where can I find maven repository for kafka? )