Flink Error: Could not find or load main class - maven

Question

I'm trying to run those Flink Benchmarks:
https://github.com/dataArtisans/flink-benchmarks
I've generated the jar file using maven with that command:
mvn clean package -Pbuild-jar
Then I'm trying to run the benchmark on a Flink Cluster with that command:
./bin/flink run -c org.apache.flink.benchmark.WindowBenchmarks ~/flinkBenchmarks/target/flink-hackathon-benchmarks-0.1.jar
I've used the -c option to add to the classpath the Main of the benchmark (WindowBenchmarks) I want to run.
Finally, I get that error:
# JMH version: 1.19
# VM version: JDK 1.8.0_151, VM 25.151-b12
# VM invoker: /usr/lib/jvm/java-8-oracle/jre/bin/java
# VM options: -Dlog.file=/home/user/flink-1.3.2/flink-dist/target/flink-1.3.2-bin/flink-1.3.2/log/flink-user-client-mypc.log -Dlog4j.configuration=file:/home/user/flink-1.3.2/flink-dist/target/flink-1.3.2-bin/flink-1.3.2/conf/log4j-cli.properties -Dlogback.configurationFile=file:/home/user/flink-1.3.2/flink-dist/target/flink-1.3.2-bin/flink-1.3.2/conf/logback.xml -Djava.rmi.server.hostname=127.0.0.1 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false
# Warmup: 10 iterations, 1 s each
# Measurement: 10 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Throughput, ops/time
# Benchmark: org.apache.flink.benchmark.WindowBenchmarks.sessionWindow
# Run progress: 0.00% complete, ETA 00:04:00
# Fork: 1 of 3
Error: Could not find or load main class org.openjdk.jmh.runner.ForkedMain
<forked VM failed with exit code 1>
<stdout last='20 lines'>
</stdout>
<stderr last='20 lines'>
Error: Could not find or load main class org.openjdk.jmh.runner.ForkedMain
</stderr>
# Run complete. Total time: 00:00:00
Benchmark Mode Cnt Score Error Units
The program didn't contain a Flink job. Perhaps you forgot to call execute() on the execution environment.
I don't have any previous experience with Flink and Maven so I find out what is missing. My first thought was that it's a missing dependencies error, but they look fine. Any suggestions?
Thank you in advance!

Answer 1

flink-benchmarks is a repository that contains sets of micro benchmarks designed to run on single machine, not on the cluster. The main functions defined in the various classes (test cases) are 'JMH' runners, not Flink programs. As such you can either execute whole benchmark suite (which takes ~1hour):
mvn -Dflink.version=1.5.0 clean install exec:exec
or if you want to execute just one benchmark, the best approach is to execute selected main function manually. For example from your IDE (don't forget about selecting flink.version, default value for the property is defined in pom.xml).
There is also a possibility to execute single benchmark from console, but I haven't tried it for very long time.