JEP 543 Finalizes Structured Concurrency in JDK 28, Ending Seven Preview Rounds
JDK 28 finalizes structured concurrency through JEP 543, with no API changes from JDK 27. Teams on JDK 27 only need to drop --enable-preview and recompile. Code written for JDK 25 or 26 must adapt to the R_X exception type parameter, ExecutionException wrapping, and the abstract timeout() joiner callback. By A N M Bazlur Rahman
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