code: public static ArrayList getServletCacheInstanceNames() {
          ArrayList list = null;
          if (ServerCache.servletCacheEnabled == false) {
              list = new ArrayList();
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
                  Tr.debug(tc, "CacheMonitor: Servlet Cache Service has not been started.");
  
          } else {
              list = getCacheService().getServletCacheInstanceNames();
          }
          return list;
      }
docs: For CacheMonitor