title: Sonar Setup Undefined Mandatory Properties
body: <p>Learning how to use SonarQube and was doing a quick install from <a href="http://docs.codehaus.org/display/SONAR/Setup+and+Upgrade">here</a></p>
  
  <p>Got all the way down to step 5. My build fails when I execute:
      C:\sonar-runner\bin\sonar-runner.bat</p>
  
  <p>I get the following error: </p>
  
  <pre><code>INFO: ------------------------------------------------------------------------
  INFO: EXECUTION FAILURE
  INFO: ------------------------------------------------------------------------
  Total time: 7.572s
  Final Memory: 8M/223M
  INFO: ------------------------------------------------------------------------
  ERROR: Error during Sonar runner execution
  ERROR: Unable to execute Sonar
  ERROR: Caused by: You must define the following mandatory properties for 'Unknown':   sonar.projectKey, sonar.projectName, sonar.projectVersion, sonar.sources
  ERROR:
  ERROR: To see the full stack trace of the errors, re-run SonarQube Runner with the -e switch.
  ERROR: Re-run SonarQube Runner using the -X switch to enable full debug logging.
  </code></pre>
  
  <p>Anyone encountered a similar situation and resolved? </p>