I have used the jdk-19 with loom preview. The --enable-preview flag hsa to be enabled for both Java Compiler and for java execution (jvm argument).
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StructuredConcurrency This example demonstrates Project Loom structured concurrency features, which enables a main task to split into several concurrent sub-tasks that run concurrently to completion before the main task can complete.
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CompareParallelFuturesAndLoomStructuredConcurrency This example compares and contrasts the programming models and performance results of Java parallel streams, completable futures, and Project Loom structured concurrency when applied to download, transform, and store many images from a remote web server.
Execution results:
Entering the program with 8 cores available
utils.OptionsImages: Parallel streams reduce()/concat() test downloaded and stored 105 images
utils.OptionsImages: Completable futures test downloaded and stored 105 images
utils.OptionsImages: Structured concurrency test downloaded and stored 105 images
Printing 3 results from fastest to slowest
Completable futures runFineGrained() test executed in 22129 msecs
Structured concurrency runFineGrained() test executed in 27668 msecs
Parallel streams run() test executed in 28578 msecs