José is a Java Developer Advocate at Oracle. He holds a PhD in applied mathematics and computer science. He has been an assistant professor at the University Sorbonne Paris Nord for 25 years. He is an active member of the Paris Java User Group, and a disorganizer of the JChateau unconference. He contributes Java learning content on the dev.java website. He publishes "Java Coding Tips", a biweekly series of shorts, and the "JEP Café", a video series, both on the Java YouTube channel.
Loom already delivered virtual threads and scoped values. It still needs to deliver one last element: the Structured Concurrency API, a preview feature of JDK 26. As of now, launching requets in parallel can be done using the ExecutorService pattern, or callback-based asynchronous programming. The Structured Concurrency API gives you new patterns of code, based on virtual threads, to launch this request in parallel, following the principle of structured imperative programming. The code you write is more readable, with less places for bugs to hide. It also gives you meaningful stack traces for better debugability and profiling. This presentation takes you through these patterns, showing you how the StructuredTaskScope objects are working, and how you can configure them. You will see how you can build your own asynchronous strategies for the handling of the results your tasks give you using Joiners, and how you can build them to exactly fit the specific needs of your application.
Understanding how to monitor and optimize Java applications is fundamental to building efficient software. This hands-on lab will introduce how to capture data to understand your application behavior using JDK Flight Recorder (JFR), manage and analyze JFR recordings, and guide you through creating custom JFR events. We will also cover how JFR can integrate with Prometheus to correlate application and infrastructure behavior, all aimed at enhancing observability. After this lab, you will have the confidence to use JFR to monitor, diagnose, and fine-tune your applications.
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