Data loading through cache ERROR

[chamini prashakthi]

I use a cache to load data to my table.Here I refresh my cache for every 5 seconds. My problem is some times my data shows as null whether my cache is not empty.But some times it shows all my data.(IT HAPPENS TIME TO TIME )

this is way that I initialize my cache

private void initializeCache()
  {
    CacheLoader<String, List<~~my Data Type~~>> cacheLoader = new CacheLoader<String, List<~~my Data Type~~>>()
    {
      @Override
      public List<~~my Data Type~~> load(String key) throws Exception
      {
        return loadingCache.get(key);
      }
    };

    this.loadingCache = CacheBuilder.newBuilder().expireAfterAccess(5, TimeUnit.SECONDS).build(cacheLoader);
  }

I use validation like this before load data to the table,

if (loadingCache.asMap().isEmpty())
    {
      final List<ArchetypeConceptData> loaded = loadByKey(ids);
        loadingCache.putAll(~~some data list~~);
    }

I  found that when I debug the program my cache is empty.But this validation shows false.So empty data list is loading to the table.(Empty table) I check with the cache size too. Then I found if my cache shows empty but the size has a value. I couldn't find a way to ged rid of this issue.can some one help me to get out from this ???