docs: public CacheSimpleConfig setCacheLoader(String cacheLoader) {
          if (cacheLoader != null && cacheLoaderFactory != null) {
              throw new IllegalStateException("Cannot set cacheLoader to '" + cacheLoader
                      + "', because cacheLoaderFactory is already set to '" + cacheLoaderFactory + "'.");
          }
          this.cacheLoader = cacheLoader;
          return this;
      }