title: Kafka-Storm integration
body: <p>We have been trying to integrate kafka-storm by referring the Learning Storm book. We have followed all the steps but on execution of the following command we are getting 'Build Failure'-
  mvn clean compile exec:java
  -Dmain.class=com.learningstorm.kafka.KafkaTopology</p>
  
  <h2>and the error is as follows-</h2>
  
  <pre><code>[INFO] BUILD FAILURE
  [INFO]------------------------------------------------------------------------
  [INFO] Total time: 3.546s
  [INFO] Finished at: Sat Jan 31 11:46:58 IST 2015
  [INFO] Final Memory: 7M/111M
  [INFO] ------------------------------------------------------------------------
  [ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project storm-example: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java are missing or invalid -&gt; [Help 1]
  [ERROR] 
  [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
  [ERROR] Re-run Maven using the -X switch to enable full debug logging.
  [ERROR] 
  [ERROR] For more information about the errors and possible solutions, please read the following articles:
  [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginParameterException
  </code></pre>
  
  <p>What should we do? Thanks in advance!</p>