Structured concurrency is a new way to use multithreading in Java. It allows developers to think about work in logical groups while taking advantage of both traditional and virtual threads. Available in preview in Java 21, structured concurrency is a key aspect of Java’s future, so now is a good time to start working with it.
Why we need structured concurrency
Writing concurrent software is one of the greatest challenges for software developers. Java’s thread model makes it a strong contender among concurrent languages, but multithreading has always been inherently tricky. Structured concurrency allows you to use multiple threads with structured programming syntax. In essence, it provides a way to write concurrent software using familiar program flows and constructs. This lets developers focus on the business at hand, instead of the orchestration of threading. As the JEP for structured concurrency says, “If a task splits into concurrent subtasks then they all return to the same place, namely the task’s code block.”
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