Java Tools Tutorials - Herong's Tutorial Examples - v6.23, by Herong Yang
jhat - Starting 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.
Warning: "jhat" has been discontinued since JDK 9. But if you still have JDK 1.8 installed, you can continue to use it to browser heap dump files generated by JDK 9 to JDK 12.
In an earlier tutorial example, I created a Java heap dump file with the "jmap" tool on my GarbageCollection.java program. The heap dump file is named as GarbageCollection.map. 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:
herong> \Progra~1\java\jdk1.8.0\bin\jhat GarbageCollection.map Reading from GarbageCollection.map... 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 heap dump first page shows up.
See next sections on how to use "jhat" Web server to browse heap objects.
Table of Contents
javac - The Java Program Compiler
java - The Java Program Launcher
jpackage - Binary Package Builder
javadoc - The Java Document Generator
jdeps - The Java Class Dependency Analyzer
jdeprscan - The Java Deprecated API Scanner
jcmd - The JVM Diagnostic Tool
jconsole - Java Monitoring and Management Console
jstat - JVM Statistics Monitoring Tool
JVM Troubleshooting Tools in JDK
jinfo - VM Option Value Checker
jinfo - Changing HotSpot VM Option
jstack - Stack Tracer to Generate Thread Dump
Java Thread Deadlock Demo Program
jstack - Detecting Java Thread Deadlocks
Printing Histogram of Java Object Heap
jmap - Generating Heap Dump File
jhat - Java Heap Analysis Tool
►jhat - Starting Web Server on a Heap Dump File
Listing Instance Counts of All Classes
Browsing Object Instance Values
Searching for Instances with OQL Statements
jhsdb - The Java HotSpot Debugger
jvisualvm (Java VisualVM) - JVM Visual Tool
javap - The Java Class File Disassembler
keytool - Public Key Certificate Tool
jrunscript - Script Code Shell
native2ascii - Native-to-ASCII Encoding Converter