finder returning collection

[Chetan Sahasrabudhe]

Hello,

HF book says that finder method returning single object will throw ObjectNotFoundException, but finders returning Collections will return empty collection for not finding any rows as per the criteria.

Returns empty collection == collection.size() = 0 OR
Returns empty collection == null

Client side validation should be,

  if(col == null || col.size()<= 0)
         //Got empty collection.

OR

  if(col.size() <= 0)
        //Got empty collection.

[Gemini Moses]

Returns empty collection == collection.size() = 0

[Chengwei Lee]

The beauty of returning an empty collection as opposed to returning null is that you do not need to incur the overheads of checking if your collection is null/non-null.

You can simply just iterate it as per usual. No checks on whether the size is 0 too (unless your situation warrants it).