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Sep 20, 2020 · Backend Development

Why HashMap Can Deadlock and Crash Your JVM – Hidden Risks of Concurrent Access

This article explains how using a non‑thread‑safe HashMap in a multithreaded Java program can cause deadlocks, CPU spikes, and memory leaks, analyzes the underlying cause in the put method, and presents safer alternatives such as Collections.synchronizedMap and ConcurrentHashMap.