It works if I’m looking at it!

time to read 1 min | 142 words

Today my team tracked down, hunted and summarily executed a bug. It was a nasty one, because under certain (pretty rare) error conditions, we would get into pretty nasty state and not recover from it.

The problem was that the code to handle this and handle the state properly was there, and on when we tested it locally, worked just fine. But on production, it didn’t work. Unless we tried to figure out why it wasn’t working, in which case it did work.

As you can imagine, this can be a pretty frustrating state of affair. Eventually we tracked it down to the following problem. Here is the relevant code. And the problem is that the exception aren’t thrown (and therefor not handled). Can you see the issue?