Gal Nitzan wrote:

this function throws IOException. Why?

        public long getPos() throws IOException {
           return (doc*INDEX_LENGTH)/maxDoc;
         }

It should be throwing ArithmeticException

The IOException is required by the API of RecordReader.

What happens when maxDoc is zero?

Ka-boom! ;-) You're right, this should be wrapped in an IOException and rethrown.

--
Best regards,
Andrzej Bialecki     <><
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