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Discontinue information

jTracert is now discontinued and no longer supported! Please use jSonde instead. It's a new tool similar to jTracert but much more powerfull, and it's absolutely free!

Find more details at jSonde site:


jTracert will allow you to generate sequence diagrams directly from your application runtime! This gives you a lot of advantages:

  • Understand the code created by your colleagues/partners in a short time
  • Rapidly generate documentation for your partners or users.
  • Easily investigate what's happening in large Java applications
  • Excellent companion for a common debugger

Quick Start


30 March 2010 - jSonde is now free and licensed under GPL v3

A successor of jTracert, a bran new tool called jSonde is now licensed under GPL v3. All users of jTracert should use jSonde instead!

26 October 2009 - replace for jTracert, jSonde 1.0 will be released soon

We're now working on a new tool which gonna replace jTracert. It's called jSonde, and it's beta version is available here:

It's not open source any more, but we plan to keep it free for personal use. Perhaps open source version will be available in future.

24 October 2009 - jtracert 0.1.3, has been tested 100% clean and rated 5 stars on

jTracert was tested thoroughly and was found 100% clean. Click the following links for details:

14 September 2009 - jTracert 0.1.3 released

A new minor version of jTracert is released - 0.1.3

Changes list:

  • Bugfixing - Issues 16, 17, 19
  • Improved instrumentation of classes, loaded by system class laoder
  • Better large method call trees support

ChangesList NewsArchive

Quick Start

Executing jTracert agent

jTracert is implemented as a small javaagent, consisting from only one jar with no dependencies. In order to profile your application with jTracert, just add the following option to VM options: -javaagent:jTracert.jar=7007

IMPORTANT! You should specify a path to jTracert.jar, so your parameter will look like: -javaagent:/home/dmitrybedrin/java/jTracert.jar=7007

7007 here is the port number for communicating with jTracert GUI - you can replace it with any other port.

Please note, that you're not limited to J2SE applications. Add this parameter to your J2EE App server options, and profile your J2EE application. It's also possible to profile applets, and almost all other types of java applications. This is a benefit of implementing jTracert in pure Java.

Executing jTracert GUI

When executing your java application with jTracert agent, you will see the following message:

jTracert agent started Waiting for a connection from jTracert GUI on port 7007

Now start jTracert GUI by executing appropriate shell wrapper (jtracert.cmd on Windows, on GNU/Linux) or just type java -jar jTracert-gui.jar, and fill in a few fields in connection dialog:

  1. Working folder (in which diagram files will be stored)
  2. Host & port of jTracert agent
  3. A regular expression for filtering classes to be instrumented and analyzed

Click on "Connect" button. That's it!


Much appreciated )

I'm also answering questions in jTracert forum, so you can ask your question here. This options is preferable since other users can also read these messages.

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