code: public CacheEntry getEntryDisk(Object cacheId) {
  		CacheEntry cacheEntry = new CacheEntry(cacheInstance.getEntryDisk(cacheId));	 
  		return cacheEntry;
  	}
docs: This method returns the cache entry specified by cache ID from the disk cache.
  
  @param cacheId the cache ID
  @return The cache entry. NULL if cache ID does not exist.