title: Set log4j log level
body: <p>I'm currently working on a project that uses log4j. 
  I'm running a testcase (junit) and would like to set the log level to trace so that I can see if all the values are correct. Classes that use logging in the project contain a line like the following:</p>
  
  <pre><code>private static final Log LOG = LogFactory.getLog(MatchTaskTest.class);
  </code></pre>
  
  <p>and use a like like this to do the actual debugging</p>
  
  <pre><code>LOG.trace("value");
  </code></pre>
  
  <p>I have never used log4j before, does anybody know how I can change the log level just for the testcase, preferably simply by defining a parameter in eclipse's run configuration dialog.</p>