code: public synchronized void add(String logSinkClass)
      {
          try
          {
              if (logSinkClass==null || logSinkClass.length()==0)
                  logSinkClass="org.browsermob.proxy.jetty.log.OutputStreamLogSink";
              Class sinkClass =  Loader.loadClass(this.getClass(),logSinkClass);
              LogSink sink=(LogSink)sinkClass.newInstance();
              add(sink);
          }
          catch(Exception e)
          {
              message(WARN,e,2);
              throw new IllegalArgumentException(e.toString());
          }
          
      }
docs: Add a Log Sink.
  @param logSinkClass The logsink classname or null for the default.