Buglyst Blog
Learn to debug under pressure.
Playbooks for fast pattern recognition, guides for the full investigation, and articles for the engineering judgment around the edges.
17 playbooks · 509 guides · 95 articles · 12 linked practice labs ·skip to practice
Fast pattern recognition for the production failures engineers see most often.
17 playbooks
Debugging Env Var Issues
A concise checklist for incidents where local works but CI, staging, or production changes behavior.
Debugging Cache Stampedes
How to recognize and contain request spikes when cached data expires.
Debugging CORS Origin Bugs
A practical way to inspect origin parsing, credentials, and header behavior.
Debugging Retry Bugs
Retry issues often hide the first failure and create duplicate work.
Debugging Timezone Bugs
Time bugs usually live at day boundaries, DST changes, and unit conversions.
Debugging Pagination Bugs
Pagination bugs hide in boundary math, cursor reuse, and new records arriving between pages.
Structured investigations for the failure modes engineers meet in real systems.
Go pprof CPU & Memory Profiling: Real-World Debugging Tactics
A hands-on debugging guide for Go pprof CPU and memory profiling with real commands, root causes, and a war story.
Debugging a Java NullPointerException: A Practical Walkthrough
A direct guide to diagnosing and fixing NullPointerExceptions in Java, with concrete commands and real troubleshooting steps.
ClassNotFoundException vs NoClassDefFoundError: How to Diagnose Java Class Loading Failures
A practical guide to distinguishing ClassNotFoundException from NoClassDefFoundError, with concrete diagnostics, common root causes, and a real incident walkthrough.
Java Thread Deadlock Detection with jstack: A Practical Guide
Learn how to detect and fix Java thread deadlocks using jstack. This guide covers real-world patterns, command-line usage, and common pitfalls.
Spring Boot Auto-configuration Not Loading: Debugging Conditional Beans
A hands-on guide to debugging Spring Boot auto-configuration failures caused by missing or mismatched conditions, with concrete commands and real-world war stories.
Spring @Transactional Not Rolling Back: Root Causes & Fixes
A senior engineer's guide to why Spring @Transactional fails to roll back — covering checked exceptions, proxy bypass, and connection commit ordering.
Long-form thinking on debugging habits, observability, and the systems around the bug.
The Debugging Mindset: A Systematic Method for Finding Root Causes
A repeatable, hypothesis-driven approach to debugging that works for intermittent failures, performance regressions, and production incidents.
Analyzing a Core Dump: What to Do When Your Process Goes Silent
A core dump is your process's last scream. Here's how to make it talk.
Timeouts Every Engineer Gets Wrong (and How to Fix Them)
Most timeout bugs aren't logic errors — they're configuration failures. Here's how to stop treating timeouts as magic numbers and start engineering them deliberately.
Backpressure in Streaming Systems: When Your Pipeline Fights Back
Backpressure is the system's way of saying 'slow down.' Ignore it and you get OOM crashes, silent data loss, or cascading failures. Here's how to design for it.
Finding Memory Leaks Step by Step: A Systematic Approach
Memory leaks are the silent killers of long-running services. Here's a repeatable process to hunt them down, from heap dumps to production monitoring.