http://peti.to/tags/java/Recent content in Java on Ben PetitoHugo -- gohugo.ioenMon, 20 Jul 2026 09:00:00 +0930http://peti.to/posts/process-was-running-system-was-dead/Mon, 20 Jul 2026 09:00:00 +0930http://peti.to/posts/process-was-running-system-was-dead/<p>A couple of weeks ago, one of the systems we built and support stopped doing its job for about 42 hours, and almost nothing looked wrong while it happened.</p> <p>It&rsquo;s a document-processing system: documents arrive by email; an AI step reads the PDFs and turns them into structured data; our application validates and processes them; and the results flow out to the customer&rsquo;s system of record. They&rsquo;d not long gone live and were steadily onboarding new clients, so the volume was climbing week on week. Over a weekend, the scheduled processing simply stopped. The web application stayed up; the Java process never fell over; and every check watching it kept reporting the service as healthy. No crash, no alert. It only surfaced because someone noticed documents weren&rsquo;t coming through, not because anything told us.</p>