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Engineer Traces Silent JVM Crash to Single PostgreSQL Config Parameter via Bytecode

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A software engineer debugging a High Availability failover cluster discovered that a secondary server was silently shutting down exactly 6-7 seconds after every startup attempt, with no stack trace or useful error message. The setup used a lean three-VM topology where the PostgreSQL database and shared filesystem were hosted on the same machine, deviating from the vendor's standard four-VM recommendation. Despite identifying and fixing four separate configuration issues — including missing directories, credential mismatches, absent database rows, and incorrect startup script order — the server continued to crash at the same interval. After exhausting vendor documentation, community forums, and database-level fixes, the engineer determined the root cause lay deeper than logs or config files could reveal. With no other options, they turned to decompiling the vendor's Java bytecode, ultimately tracing the crash to a single PostgreSQL configuration parameter.

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