code: public static JKCacheManager getCacheManager() {
  		if (JKCacheFactory.defaultCacheManager == null) {
  			logger.debug("init cacheManager");
  			defaultCacheManager = new JKDefaultCacheManager();
  		}
  		return JKCacheFactory.defaultCacheManager;
  	}
docs: Gets the default cache manager.
  
  @return the default cache manager