当Guava CacheLoader无法加载数据时，应该抛出什么异常？

Question

I am implementing simple guava CacheLoader as it is stated here

   CacheLoader<Key, Graph> loader = new CacheLoader<Key, Graph>() {
     public Graph load(Key key) throws AnyException {
       return createExpensiveGraph(key);
     }
   };
   LoadingCache<Key, Graph> cache = CacheBuilder.newBuilder().build(loader);

Does this mean that I should create my own exception class and throw it if the value is null or is there any better way to hande the situation?

Answer 1

You're allowed to throw whatever exception you want -- that can be something you made, or something built-in. There's no special rule for what exception is most appropriate for caches -- just use whatever exception would be most appropriate otherwise.