https://github.com/marschall/catalina-jfr

a Catalina Valve that generates JFR events
https://github.com/marschall/catalina-jfr

java-flight-recorder tomcat

Last synced: 3 months ago
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a Catalina Valve that generates JFR events

• Host: GitHub
• URL: https://github.com/marschall/catalina-jfr
• Owner: marschall
• Created: 2018-12-09T11:42:42.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2025-03-01T21:31:45.000Z (3 months ago)
• Last Synced: 2025-03-01T22:24:25.174Z (3 months ago)
• Topics: java-flight-recorder, tomcat
• Language: Java
• Size: 485 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        

Catalina JFR

============

A Catalina [valve](https://tomcat.apache.org/tomcat-9.0-doc/config/valve.html) that generates [Flight Recorder](https://openjdk.java.net/jeps/328) events. Unlike a filter based approach a valve based approach also generate events for internal servlets like the `DefaultServlet` and `JasperServlet`.

![Flight Recording of some HTTP requests](https://github.com/marschall/catalina-jfr/raw/master/src/main/javadoc/Screenshot.png)

This project requires Java 11.

Usage

-----

Copy the jar to `${tomcat.home}/lib` and add the following valve to `server.xml`.

```xml

        

```

Correlating Dispatches

----------------------

A single request may traverse the servlet chain multiple times, either because of a server side redirect or because of asynchronous processing. We generate a unique exchangeId for every request so that multiple dispatches of the same request can be correlated.