Multithreaded programming is never easy for beginners. A special case of error that we can encounter is thread leakage and loss of control over possible errors that arise in them. Structured concurrency introduced as a preview feature in JDK 21 and redesigned in JDK 25 can help us deal with both of the above problems. During the presentation we will get to know the general idea of ​​structured concurrency, we will learn about different error handling policies and we will try to use the acquired knowledge in solving a real business problem.

This talk has been delivered on Devoxx Poland 2025 (as a 3h workshop) and JDD 2025 (as a regular 45 min session).