Update a HTTP listener configuration.
void updateHTTPListenerConfiguration(SUPConfigurationComponentVO webContainerComponent)  
      throws SUPAdminException; 
  If successful, returns silently. If unsuccessful, throws SUPAdminException.
supConf.refreshWebContainerConfiguration();
SUPConfigurationComponentVO confVO = supConf           
        .getHTTPListenerConfigurations().iterator().next(); 
confVO.getProperties().put("maxThreads", "50");   
supConf.updateHTTPListenerConfiguration(confVO);   
supConf.commitWebContainerConfiguration();