class file for org.apache.flink.api.common.serialization.DeserializationSchema not found
Question
I'm trying to develop a flink stream job. The job should read from a kafka topic.
I've tried to update the example at https://github.com/dataArtisans/kafka-example/blob/master/src/main/java/com/dataartisans/ReadFromKafka.java
I want to use Flink 1.4 and Kafka 0.11.
When I try to build the (maven) project I get the following error:
[ERROR] /quickstart/src/main/java/org/myorg/quickstart/StreamingJob.java:[20,66] cannot access org.apache.flink.api.common.serialization.DeserializationSchema
class file for org.apache.flink.api.common.serialization.DeserializationSchema not found
[INFO] 1 error
...
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project quickstart: Compilation failure
[ERROR] /quickstart/src/main/java/org/myorg/quickstart/StreamingJob.java:[20,66] cannot access org.apache.flink.api.common.serialization.DeserializationSchema
[ERROR] class file for org.apache.flink.api.common.serialization.DeserializationSchema not found
Are there any ideas how to resolve this error? So far, I wasn't able to find a solution.
Files
StreamingJob.java
package org.myorg.quickstart;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.utils.ParameterTool;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer08;
import org.apache.flink.streaming.util.serialization.JSONKeyValueDeserializationSchema;
import org.apache.flink.streaming.util.serialization.KeyedDeserializationSchema;
public class StreamingJob {
public static void main(String[] args) throws Exception {
// set up the streaming execution environment
final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
// parse user parameters
ParameterTool parameterTool = ParameterTool.fromArgs(args);
DataStream<String> messageStream = env.addSource(new FlinkKafkaConsumer08<String>(parameterTool.getRequired("topic"), (KeyedDeserializationSchema) new JSONKeyValueDeserializationSchema(true), parameterTool.getProperties()));
// print() will write the contents of the stream to the TaskManager's standard out stream
// the rebelance call is causing a repartitioning of the data so that all machines
// see the messages (for example in cases when "num kafka partitions" < "num flink operators"
messageStream.rebalance().map(new MapFunction<String, String>() {
private static final long serialVersionUID = -6867736771747690202L;
@Override
public String map(String value) throws Exception {
return "Kafka and Flink says: " + value;
}
}).print();
// execute program
env.execute("Flink Streaming Java API Skeleton");
}
}
pom.xml
<!--
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or more contributor license agreements. See the NOTICE file
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.myorg.quickstart</groupId>
<artifactId>quickstart</artifactId>
<version>0.1</version>
<packaging>jar</packaging>
<name>Flink Quickstart Job</name>
<url>http://www.myorganization.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<flink.version>1.3.0</flink.version>
<slf4j.version>1.7.7</slf4j.version>
<log4j.version>1.2.17</log4j.version>
<scala.binary.version>2.10</scala.binary.version>
</properties>
<repositories>
<repository>
<id>apache.snapshots</id>
<name>Apache Development Snapshot Repository</name>
<url>https://repository.apache.org/content/repositories/snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
<!--
Execute "mvn clean package -Pbuild-jar"
to build a jar file out of this project!
How to use the Flink Quickstart pom:
a) Adding new dependencies:
You can add dependencies to the list below.
Please check if the maven-shade-plugin below is filtering out your dependency
and remove the exclude from there.
b) Build a jar for running on the cluster:
There are two options for creating a jar from this project
b.1) "mvn clean package" -> this will create a fat jar which contains all
dependencies necessary for running the jar created by this pom in a cluster.
The "maven-shade-plugin" excludes everything that is provided on a running Flink cluster.
b.2) "mvn clean package -Pbuild-jar" -> This will also create a fat-jar, but with much
nicer dependency exclusion handling. This approach is preferred and leads to
much cleaner jar files.
-->
<dependencies>
<!-- Apache Flink dependencies -->
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-java</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-java_2.10</artifactId>
<version>${flink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients_2.10</artifactId>
<version>${flink.version}</version>
</dependency>
<!-- explicitly add a standard loggin framework, as Flink does not have
a hard dependency on one specific framework by default -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-kafka-0.8_2.11</artifactId>
<version>1.4-SNAPSHOT</version>
</dependency>
</dependencies>
<profiles>
<profile>
<!-- Profile for packaging correct JAR files -->
<id>build-jar</id>
<activation>
<activeByDefault>false</activeByDefault>
</activation>
<dependencies>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-java</artifactId>
<version>${flink.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-java_2.10</artifactId>
<version>${flink.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients_2.10</artifactId>
<version>${flink.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<!-- disable the exclusion rules -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<excludes combine.self="override"></excludes>
</artifactSet>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
<build>
<plugins>
<!-- We use the maven-shade plugin to create a fat jar that contains all dependencies
except flink and its transitive dependencies. The resulting fat-jar can be executed
on a cluster. Change the value of Program-Class if your program entry point changes. -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.1</version>
<executions>
<!-- Run shade goal on package phase -->
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<excludes>
<!-- This list contains all dependencies of flink-dist
Everything else will be packaged into the fat-jar
-->
<exclude>org.apache.flink:flink-annotations</exclude>
<exclude>org.apache.flink:flink-shaded-hadoop2</exclude>
<exclude>org.apache.flink:flink-shaded-curator-recipes</exclude>
<exclude>org.apache.flink:flink-core</exclude>
<exclude>org.apache.flink:flink-java</exclude>
<exclude>org.apache.flink:flink-scala_2.10</exclude>
<exclude>org.apache.flink:flink-runtime_2.10</exclude>
<exclude>org.apache.flink:flink-optimizer_2.10</exclude>
<exclude>org.apache.flink:flink-clients_2.10</exclude>
<exclude>org.apache.flink:flink-avro_2.10</exclude>
<exclude>org.apache.flink:flink-examples-batch_2.10</exclude>
<exclude>org.apache.flink:flink-examples-streaming_2.10</exclude>
<exclude>org.apache.flink:flink-streaming-java_2.10</exclude>
<exclude>org.apache.flink:flink-streaming-scala_2.10</exclude>
<exclude>org.apache.flink:flink-scala-shell_2.10</exclude>
<exclude>org.apache.flink:flink-python</exclude>
<exclude>org.apache.flink:flink-metrics-core</exclude>
<exclude>org.apache.flink:flink-metrics-jmx</exclude>
<exclude>org.apache.flink:flink-statebackend-rocksdb_2.10</exclude>
<!-- Also exclude very big transitive dependencies of Flink
WARNING: You have to remove these excludes if your code relies on other
versions of these dependencies.
-->
<exclude>log4j:log4j</exclude>
<exclude>org.scala-lang:scala-library</exclude>
<exclude>org.scala-lang:scala-compiler</exclude>
<exclude>org.scala-lang:scala-reflect</exclude>
<exclude>com.data-artisans:flakka-actor_*</exclude>
<exclude>com.data-artisans:flakka-remote_*</exclude>
<exclude>com.data-artisans:flakka-slf4j_*</exclude>
<exclude>io.netty:netty-all</exclude>
<exclude>io.netty:netty</exclude>
<exclude>commons-fileupload:commons-fileupload</exclude>
<exclude>org.apache.avro:avro</exclude>
<exclude>commons-collections:commons-collections</exclude>
<exclude>org.codehaus.jackson:jackson-core-asl</exclude>
<exclude>org.codehaus.jackson:jackson-mapper-asl</exclude>
<exclude>com.thoughtworks.paranamer:paranamer</exclude>
<exclude>org.xerial.snappy:snappy-java</exclude>
<exclude>org.apache.commons:commons-compress</exclude>
<exclude>org.tukaani:xz</exclude>
<exclude>com.esotericsoftware.kryo:kryo</exclude>
<exclude>com.esotericsoftware.minlog:minlog</exclude>
<exclude>org.objenesis:objenesis</exclude>
<exclude>com.twitter:chill_*</exclude>
<exclude>com.twitter:chill-java</exclude>
<exclude>commons-lang:commons-lang</exclude>
<exclude>junit:junit</exclude>
<exclude>org.apache.commons:commons-lang3</exclude>
<exclude>org.slf4j:slf4j-api</exclude>
<exclude>org.slf4j:slf4j-log4j12</exclude>
<exclude>log4j:log4j</exclude>
<exclude>org.apache.commons:commons-math</exclude>
<exclude>org.apache.sling:org.apache.sling.commons.json</exclude>
<exclude>commons-logging:commons-logging</exclude>
<exclude>commons-codec:commons-codec</exclude>
<exclude>com.fasterxml.jackson.core:jackson-core</exclude>
<exclude>com.fasterxml.jackson.core:jackson-databind</exclude>
<exclude>com.fasterxml.jackson.core:jackson-annotations</exclude>
<exclude>stax:stax-api</exclude>
<exclude>com.typesafe:config</exclude>
<exclude>org.uncommons.maths:uncommons-maths</exclude>
<exclude>com.github.scopt:scopt_*</exclude>
<exclude>commons-io:commons-io</exclude>
<exclude>commons-cli:commons-cli</exclude>
</excludes>
</artifactSet>
<filters>
<filter>
<artifact>org.apache.flink:*</artifact>
<excludes>
<!-- exclude shaded google but include shaded curator -->
<exclude>org/apache/flink/shaded/com/**</exclude>
<exclude>web-docs/**</exclude>
</excludes>
</filter>
<filter>
<!-- Do not copy the signatures in the META-INF folder.
Otherwise, this might cause SecurityExceptions when using the JAR. -->
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
<!-- If you want to use ./bin/flink run <quickstart jar> uncomment the following lines.
This will add a Main-Class entry to the manifest file -->
<!--
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.myorg.quickstart.StreamingJob</mainClass>
</transformer>
</transformers>
-->
<createDependencyReducedPom>false</createDependencyReducedPom>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source> <!-- If you want to use Java 8, change this to "1.8" -->
<target>1.7</target> <!-- If you want to use Java 8, change this to "1.8" -->
</configuration>
</plugin>
</plugins>
<!-- If you want to use Java 8 Lambda Expressions uncomment the following lines -->
<!--
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<compilerId>jdt</compilerId>
</configuration>
<dependencies>
<dependency>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-compiler-jdt</artifactId>
<version>0.21.0</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<versionRange>[2.4,)</versionRange>
<goals>
<goal>single</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore/>
</action>
</pluginExecution>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<versionRange>[3.1,)</versionRange>
<goals>
<goal>testCompile</goal>
<goal>compile</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore/>
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>
-->
</build>
</project>
2 answers
solution1
3 ACCPTED 2017-12-29 20:29:35
I think its because you are trying to use flink 1.3.0 according to your Pom.xml.
<flink.version>1.3.0</flink.version>
DeserializationSchema is in org.apache.flink.streaming.util.serialization for 1.3.0. not where its trying to look. Should be able to change the version to 1.4.1 in your pom.xml to
<flink.version>1.4.1</flink.version>
solution2
1 2017-12-29 20:32:33
You need to add this maven dependency:
<!-- https://mvnrepository.com/artifact/org.apache.flink/flink-core -->
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-core</artifactId>
<version>1.4.0</version>
</dependency>
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