Jan 29, 2020
Monitoring REST APIs with Custom JDK Flight Recorder Events
The JDK 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.
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Jan 20, 2020
Enforcing Java Record Invariants With Bean Validation
Record types are one of the most awaited features in Java 14; they promise to "provide a compact syntax for declaring classes which are transparent holders for shallowly immutable data". One example where records should be beneficial are data transfer objects (DTOs), as e.g. found in the remoting layer of enterprise applications. Typically, certain rules should be applied to the attributes of such DTO, e.g. in terms of allowed values. The goal of this blog post is to explore how such invariants can be enforced on record types, using annotation-based constraints as provided by the Bean Validation API.
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Jan 13, 2020
Using Java 13 Text Blocks (Only) for Your Tests
When Java 9 was introduced in 2017, it was the last major version published under the old release scheme. Since then, a six month release cadence has been adopted. This means developers don’t have to wait years for new APIs and language features, but they can get their hands onto the latest additions twice a year. In this post I’d like to describe how you can try out new language features such as Java 13 text blocks in the test code of your project, while keeping your main code still compatible with older Java versions.
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Jan 3, 2020
Quarkus Qute – A Test Ride
One of the long-awaited features in Quarkus was support for server-side templating: until recently, Quarkus supported only client-side web frameworks which obtain there data by calling a REST API on the backend. This has changed with Quarkus 1.1: it comes with a brand-new template engine named Qute, which allows to build web applications using server-side templates.
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Dec 26, 2019
Automatically Deploying a Hugo Website via GitHub Actions
As a software engineer, I like to automate tedious tasks as much as possible. The deployment of this website is no exception: it is built using the Hugo static site generator and hosted on GitHub Pages; so wouldn’t it be nice if the rendered website would automatically be published whenever an update is pushed to its source code repository?
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Dec 26, 2019
Time for a New Blog
It has been quite a while since the last post on my old personal blog; since then, I’ve mostly focused on writing about my day-work on the Debezium blog as well as some posts about more general technical topics on the Hibernate team blog.
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