Gunnar Morling on foojay.io - Friends of OpenJDK

Towards Continuous Performance Regression Testing

Thu, 25 Feb 2021 09:44:43 +0000

Functional unit and integration tests are a standard tool of any software development organization, helping not only to ensure correctness of newly implemented code, but also to identify regressions — bugs in existing functionality introduced by a code change. The situation looks different though when it comes to regressions related to non-functional requirements, in particular performance-related ones: How to detect increased response times in a web application? How to identify decreased throughput?

JmFrX: A Bridge From JMX to Java Flight Recorder

Thu, 03 Sep 2020 09:24:29 +0000

I’m excited to share news about an open-source utility I’ve been working on lately: JmFrX , a tool for capturing JMX data with Java Flight Recorder.

When using JMX (Java Management Extensions ), the Java platform’s standard for monitoring and managing applications, JmFrX allows you to periodically record the attributes from any JMX MBean into Java Flight Recorder (JFR) files, which you then can analyse using JDK Mission Control (JMC).

Monitoring REST APIs with Custom Java Flight Recorder Events

Wed, 26 Aug 2020 08:36:57 +0000

The Java Flight Recorder (JFR) is an invaluable tool for gaining deep insights into the performance characteristics of Java applications. Open-sourced in JDK 11, JFR provides a low-overhead framework for collecting events from Java applications, the JVM and the operating system.

In this blog post, we’re going to explore how custom, application-specific JFR events can be used to monitor a REST API, allowing to track request counts, identify long-running requests and more. We’ll also discuss how the JFR Event Streaming API , new in Java 14, can be used to export live events, making them available for monitoring and alerting via tools such as Prometheus and Grafana.