Essential Java Debugging & Performance Tools: jstack, jmap, jhat, and More

This article introduces a collection of essential Java tools—including jstack, jmap, jhat, jstat, jdb, jcmd, jps, jinfo, javap, javac, jconsole, and jvisualvm—explaining their purposes, common commands, and how they help diagnose memory leaks, CPU spikes, thread issues, and overall JVM performance.

DebuggingJavajhat

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Essential Java Debugging & Performance Tools: jstack, jmap, jhat, and More

FunTester

Dec 9, 2019 · Backend Development

Programmatically Dump JVM Heap and Analyze with jhat: A Step-by-Step Guide

This guide shows how to programmatically generate a JVM heap dump using HotSpotDiagnosticMXBean, retrieve the binary file, and analyze it offline with the jhat tool, including code snippets, usage notes, and visualization of memory usage.

Heap DumpHotSpotDiagnosticMXBeanJVM

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Programmatically Dump JVM Heap and Analyze with jhat: A Step-by-Step Guide

Meituan Technology Team

Oct 1, 2016 · Backend Development

Debugging Spring MVC @Service Bean Injection Issues with JMap and JHat

The article explains how a Spring MVC service bean was duplicated across root and child WebApplicationContexts, causing a null‑injected instance that triggered a NullPointerException, and shows how JMap and JHat were used to locate the two beans and resolve the issue by adjusting component‑scan filters or removing the @Service annotation.

Bean InjectionDebuggingJava

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Debugging Spring MVC @Service Bean Injection Issues with JMap and JHat