Spring Boot in Real Production: What My Lakaut Codebase Taught Me That the Official Docs Leave Out A datasource pool is basically like the ticket booth at a sold-out stadium show. When the crowd is light, everything works perfectly — people show up, grab their spot, walk in. But when the stadium fills up all at once and 300 people are trying to get through the gate simultaneously, the whole system collapses. Not because it's broken. Because it was never designed for that peak moment. And the official Spring Boot documentation shows you the empty ticket booth. It never shows you the concert. That's exactly what I ran into at Lakaut Hub — the core system for Lakaut AC, the digital certification authority where I work as architect. Real production. Real load. Logs that don't lie. My thesis is an uncomfortable one: Spring Boot is documented for an idealized environment that doesn't exist on PaaS platforms like Railway .…