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Andy Wilkinson 5dea4c5a03 Wait for server port to be written in a more robust manner
Previously, we just waited for the file to exist before trying to read
the port from it. This left a window where the file existed but its
contents had not be written which could result in a
NumberFormatException.

This commit now waits for the file to have a length that is greater
than zero.

See gh-7379
2016-11-17 20:41:25 +00:00
..