A fast SQL query loaded 100,000 Hibernate entities, exhausted the JVM heap, and exposed why previews and full reports need different retrieval boundaries.
The Database Was Fast. Our Spring Boot API Still Ran Out of Memory. Read More »
A hidden server timezone shifted a Spring Boot Quartz job by seven hours, causing the report to query the wrong business-day transaction window.
Quartz Succeeded, but the Report Was Still Wrong Read More »
A Spring Boot outage showed how green readiness probes hid Tomcat thread exhaustion, slow dependencies, and broken timeout design.
Why Our Spring Boot Health Check Lied During an Outage Read More »
Learn how partition-level Kafka lag, slow consumer paths, hot keys, and worker handoffs reveal delays that total lag dashboards can hide from teams.
Postman timed out while Spring Boot kept sending Kafka jobs. See how SSE progress, idempotency, and async boundaries fixed it.
Postman Timed Out, but Kafka Was Still Receiving Jobs Read More »
Redis memory kept growing in Spring Boot because cache keys had no TTL, maxmemory, eviction policy, or namespace-level monitoring.
Spring Boot Did Not Leak Memory. Redis Had No Exit Read More »
A production-style Java file handling lesson about Files.move(), reused filenames, race conditions, and safer file lifecycle design.
Backend reporting lesson on summary tables, mutable transactions, report snapshots, data lineage, and reproducible monthly totals.
Why the Same Monthly Report Keeps Showing Different Numbers Read More »
A production lesson on reporting database migrations, historical data paths, and checks that prevent broken monthly reports today.
Fixing This Month’s Report Shouldn’t Break Last Month’s Read More »
Learn how to build trusted report automation with data readiness, reconciliation, audit trails, and verification.
Before You Automate Reports, Make Sure You Can Trust the Data Read More »