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  3. Production Postmortems Flyway Jar Deploy Duplicate Beans
Platform Engineering14 lug 2026•Reading time10 min

Three Production Postmortems: Flyway, JAR Deploy, and Duplicate Beans

A comment in an applied Flyway migration breaks the checksum. A non-atomic cp during deploy causes an intermittent NoClassDefFoundError. Two beans with the same simple name crash the boot. Three real incidents, one root cause: violated immutability.

FlywaySpring BootPostmortemDeployProduction Reliability

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A comment in an applied Flyway migration breaks the checksum. A non-atomic cp during deploy causes an intermittent NoClassDefFoundError. Two beans with the same simple name crash the boot. Three real incidents, one root cause: violated immutability.

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