Starting 'jhat' Web Server on a Heap Dump File

This section provides a tutorial example on how to start 'jhat' as a Web server on a Java heap dump file allowing you to browse Java heap objects.

In an earlier tutorial example, I created a Java heap dump file with the "jmap" tool on my program. The heap dump file is named as Now I want to try to run the "jhat" Web server on this dump file and browse the heap dump with a Web browser.

1. Run the "jhat" command with default options:


Reading from
Dump file created Jan 1 00:08:10 EDT 2008
Snapshot read, resolving...
Resolving 67324 objects...
Chasing references, expect 13 dots.............
Eliminating duplicate references.............
Snapshot resolved.
Started HTTP server on port 7000
Server is ready.

2. Run a Web browser with http://localhost:7000. The "jhat" heap dump file server page shows up:
jhat Heap Dump File Server

See next sections on how to use "jhat" Web server to browse heap objects.

Last update: 2015.

Table of Contents

 About This Book

 Java Tools Terminology

 Installing Java 8 on Windows

 'javac' - The Java Program Compiler

 'java' - The Java Program Launcher

 'jdb' - The Java Debugger

 'jconsole' - Java Monitoring and Management Console

 'jstat' - JVM Statistics Monitoring Tool

JVM Troubleshooting Tools

 JVM Troubleshooting Tools in JDK 1.5

 'jinfo' - VM Option Value Checker

 Changing HotSpot VM Option using 'jinfo'

 'jstack' - Stack Tracer to Generate Thread Dump

 What Is a Thread Dump?

 Java Thread Deadlock Demo Program

 Detecting Java Thread Deadlocks with 'jstack'

 'jmap' - JVM Heap Dump Tool

 Printing Histogram of Java Object Heap

 Generating Heap Dump File with 'jmap'

 'jhat' - Java Heap Analysis Tool

Starting 'jhat' Web Server on a Heap Dump File

 Listing Instance Counts of All Classes

 Browsing Object Instance Values

 Object Query Language (OQL)

 Searching for Instances with OQL Statements

 jvisualvm (Java VisualVM) - JVM Visual Tool

 'jar' - The JAR File Tool

 'javap' - The Java Class File Disassembler

 'keytool' - Public Key Certificate Tool

 'native2ascii' - Native-to-ASCII Encoding Converter

 Outdated Tutorials


 PDF Printing Version