code: @Override
      public void setUserName(String userName) {
          if (com.ibm.ejs.ras.TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_CORE.isLoggable(Level.FINE)) {
              StringBuffer sb = new StringBuffer(newValueString).append(userName).append(oldValueString).append(_userName).append(appNameAndIdString);
              LoggingUtil.SESSION_LOGGER_CORE.logp(Level.FINE, methodClassName, "setUserName", sb.toString());
          }
          _userName = userName;
      }
docs: /*
  @see com.ibm.wsspi.session.ISession#setUserName(java.lang.String)