CODEWITHSUNDEEP
javamavenintellij-ideaapache-flinkword-count
mKaepke
mKaepke

Reputation: 81

Apache Flink WordCount Example - Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/flink/api/common/functions/FlatMapFunction

I followed this guide, but I get an Exception if I run WordCount from my IDE

/usr/lib/jvm/java-8-oracle/bin/java -Didea.launcher.port=7536 -Didea.launcher.bin.path=/home/marc/Programs/idea-IC-162.2032.8/bin -Dfile.encoding=UTF-8 -classpath "/usr/lib/jvm/java-8-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-8-oracle/jre/lib/deploy.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/cldrdata.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/dnsns.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/jaccess.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/jfxrt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/localedata.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/nashorn.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/sunec.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/sunjce_provider.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/sunpkcs11.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/zipfs.jar:/usr/lib/jvm/java-8-oracle/jre/lib/javaws.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jce.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jfr.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jfxswt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-8-oracle/jre/lib/management-agent.jar:/usr/lib/jvm/java-8-oracle/jre/lib/plugin.jar:/usr/lib/jvm/java-8-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar:/home/marc/apache flink/flink.gelly/target/classes:/home/marc/Programs/idea-IC-162.2032.8/lib/idea_rt.jar" com.intellij.rt.execution.application.AppMain haw.bachelor.flink.gelly.WordCount
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/flink/api/common/functions/FlatMapFunction
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:123)
Caused by: java.lang.ClassNotFoundException: org.apache.flink.api.common.functions.FlatMapFunction
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)
... 3 more

my environment:

Upvotes: 8

Views: 6667

Answers (4)

Chris Trahey
Chris Trahey

Reputation: 18290

In Intellij IDEA (2020.3), the UI is a little different.

Steps:

  1. Activate Run-Configuration dropdown Activate run-configuration dropdown
  2. click Edit Configurations... Edit Run Configuration
  3. click Modify Options Select Modify Options
  4. select include dependencies with "Provided" scope Select include dependencies with provided scope
  5. Click "done"

Flink sources should now be included, which should resolve the error encountered - it did for me!

Upvotes: 7

huang botao
huang botao

Reputation: 416

here is what i changed setting and the error was gone here is what i changed

Upvotes: 17

Ahmad Eldefrawy
Ahmad Eldefrawy

Reputation: 11

I solved this issue by deactivating 'build-jar' profile in Maven in the IDE. It seems that turning that off will enable run-time classes to be available.

Upvotes: 0

Chobeat
Chobeat

Reputation: 3525

If you run it in your IDE, you must select "mainRunner" instead of "root" from the "Run Configurations" menu. It makes the classpath load the classes that are "provided" in the project.

Upvotes: 0

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