Search code examples
javamavenapache-storm

Apache Storm - Could not find or load main class org.apache.storm.starter.ExclamationTopology

I'm really new to maven and storm so I'm trying to follow the instructions in https://github.com/apache/storm/tree/master/examples/storm-starter. My current path is /home/luc/theTest/storm/examples/storm-starter. Inside the target folder there is a storm-starter-2.0.0-SNAPSHOT.jar file. I'm getting stuck when running

storm jar target/storm-starter-*.jar org.apache.storm.starter.ExclamationTopology -local

I get this error

ionTopology -local Running: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -client -Ddaemon.name= -Dstorm.options= -Dstorm.home=/home/luc/stormTest/apache-storm-1.1.1 -Dstorm.log.dir=/home/luc/stormTest/apache-storm-1.1.1/logs -Djava.library.path=/usr/local/lib:/opt/local/lib:/usr/lib -Dstorm.conf.file= -cp /home/luc/stormTest/apache-storm-1.1.1/lib/servlet-api-2.5.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/slf4j-api-1.7.21.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/objenesis-2.1.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/kryo-3.0.3.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/log4j-core-2.8.2.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/log4j-over-slf4j-1.6.6.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/storm-core-1.1.1.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/log4j-slf4j-impl-2.8.2.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/minlog-1.3.0.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/log4j-api-2.8.2.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/clojure-1.7.0.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/ring-cors-0.1.5.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/asm-5.0.3.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/reflectasm-1.10.1.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/disruptor-3.3.2.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/storm-rename-hack-1.1.1.jar:target/storm-starter-2.0.0-SNAPSHOT.jar:/home/luc/stormTest/apache-storm-1.1.1/conf:/home/luc/stormTest/apache-storm-1.1.1/bin -Dstorm.jar=target/storm-starter-2.0.0-SNAPSHOT.jar -Dstorm.dependency.jars= -Dstorm.dependency.artifacts={} org.apache.storm.starter.ExclamationTopology -local Error: Could not find or load main class org.apache.storm.starter.ExclamationTopology

Am I doing something wrong? I'm also a bit confused on whether I have to run the nimbus and supervisor first. I tried with and without them and neither worked anyways. Been searching the web but nothing works. Not sure what else to try.

Solution

  • This is usually caused by inconsistent versions of storm-client and storm-starter. Try following these steps to get the example working.

    1. download the latest release from http://storm.apache.org/downloads.html

      • in this example, we will use version 1.1.1

    2. extract this to a folder, lets call it ${STORM_HOME}

    3. cd into ${STORM_HOME}/examples/storm-starter

    4. execute mvn package -DskipTests=true

      • this should build the storm-starter jar in target folder
        ${STORM_HOME}/examples/storm-starter/target/storm-starter-1.1.1.jar

    5. run the example from ${STORM_HOME} directory:
      ./bin/storm jar examples/storm-starter/target/storm-starter-1.1.1.jar org.apache.storm.starter.ExclamationTopology

    don't add the -local flag since it seems like the ExclamationTopology is only deployed in a LocalCluster if no args are passed. You can check the source code here:
    ${STORM_HOME}/examples/storm-starter/src/jvm/org/apache/storm/starter/ExclamationTopology.java