Showing Post From Production-Debugging
The Production Outage — Where the Fix Was Worse Than the Bug
One missing property line.
Two production outages.
The hot fix between them made the second one inevitable.
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A Customer Couldn’t Upload an Invoice. The Fix Re-Taught Me XSD, JAXB, and Maven.
A Polish customer reports their invoice won’t upload.
The file looks valid. Other Polish customers upload fine.
Three days later I’ve read more of the Polish Tax Code than I’d like to admit.
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What Jackson Doesn’t Deserialize for Free: The Empty Array That Took Down a Production Endpoint
A 503. Every 30 seconds, on the dot.
Sentry was empty. The application logs said the request was fine.
Then we looked at what Jackson was actually parsing.
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One Email. Two Invoices. The 10-Month Bug Hiding Behind a Slack Alert.
A Slack alert said “duplicate notification.”
A 2-line fix would have shipped it the same day.
Both were wrong.
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