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Ops Development Stories

Nov 9, 2023 · Operations

How to Pinpoint Java Out‑Of‑Memory Errors Using jmap and VisualVM

This guide explains why frequent garbage collection and heap memory overflow occur in Java applications, demonstrates how to reproduce the issue with a sample program, and walks through various techniques—including jmap histograms, heap dumps, VisualVM analysis, and remote JMX monitoring—to diagnose and resolve out‑of‑memory errors.

Garbage CollectionHeap DumpJava

0 likes · 9 min read

How to Pinpoint Java Out‑Of‑Memory Errors Using jmap and VisualVM

Spring Full-Stack Practical Cases

Oct 9, 2023 · Backend Development

Master JDK Command-Line Tools for Java Troubleshooting

This guide explains how to use JDK command-line utilities such as jps, jstat, jinfo, jmap, jhat, and jstack to monitor JVM processes, inspect memory usage, generate heap dumps, and diagnose performance issues, providing command syntax, options, and practical examples.

JDKJavaTroubleshooting

0 likes · 8 min read

Master JDK Command-Line Tools for Java Troubleshooting

Spring Full-Stack Practical Cases

May 2, 2021 · Backend Development

Master Java’s Built‑In Diagnostic Tools: jps, jstat, jinfo, jmap, jhat & jstack

This guide explains where Java's command‑line tools reside, why they are small wrappers around tools.jar, and provides detailed usage, options, and examples for the most common diagnostics utilities—including jps, jstat, jinfo, jmap, jhat, and jstack—helping developers monitor and troubleshoot JVM processes effectively.

JDKJavadiagnostic tools

0 likes · 7 min read

Master Java’s Built‑In Diagnostic Tools: jps, jstat, jinfo, jmap, jhat & jstack

360 Quality & Efficiency

Jun 14, 2019 · Backend Development

Diagnosing and Resolving a Java Process Memory Leak Using GC Logs and jmap

After observing a Java process with persistently high memory usage, the article details a step‑by‑step investigation using top, ps, GC logging, and jmap to identify a memory leak caused by a third‑party jar, and shows how adjusting JVM parameters and fixing the code resolved the issue.

CMSJavabackend development

0 likes · 6 min read

Diagnosing and Resolving a Java Process Memory Leak Using GC Logs and jmap

360 Zhihui Cloud Developer

Nov 8, 2016 · Backend Development

Quickly Diagnose High CPU Usage in Java/Tomcat with jstack and Jstat

This article explains how to identify and resolve intermittent high CPU usage in Java/Tomcat services by analyzing thread stacks with jstack, examining GC behavior with Jstat, and using Jmap for memory inspection, providing step‑by‑step commands and practical tips for ops engineers.

CPUJavaTomcat

0 likes · 7 min read

Quickly Diagnose High CPU Usage in Java/Tomcat with jstack and Jstat