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Add structured-concurrency-final module: StructuredTaskScope final in JDK 28 (JEP 543), run on 28-ea, 27, 26 and 25

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Runnable demos for the ankurm.com structured-concurrency-java article: the ExecutorService thread leak and its fix, every built-in Joiner,
structure violations, timeouts, a custom Joiner, JSON thread dumps (in-process and jcmd), scoped values, javap diffs of the API on 25, 26, 27 and 28-ea,
compiler output for six pieces of 25/26-era code, and the preview class-file trap between 27 and 28. Transcripts in output/.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01CifR2BE7PBvRy5hT8TS9oz
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Claude
2026-10-26 02:01:31 +00:00
parent 2e25042a68
commit c93a1fffbb
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@@ -71,6 +71,7 @@ These modules keep only sources, a `run.sh` and their transcripts (`output/`). T
| [`http3/`](http3) | HTTP/3 in the Java HTTP Client (JEP 517): Migrating from HttpClient 11 | Java 11 code unchanged on 25 and 26, the `HTTP_3` opt-in on client vs request, the three `H3_DISCOVERY` modes, fallback timings (including the 60 s `HTTP_3_URI_ONLY` failure), proxy downgrade, HTTP/1.1 vs 2 vs 3 under iptables packet loss, with a local Hypercorn + aioquic server |
| [`compact-strings/`](compact-strings) | Compact Strings in Java: Measured with JOL on JDK 25 (plus Compact Object Headers) | the `String` object and its `byte[]` field by field, Latin-1 vs UTF-16 footprint by length, one million strings with and without `-XX:-CompactStrings`, what flips a string to UTF-16 (and what flips it back), compact object headers on JDK 25 (opt-in) vs 27 (default), a JMH comparison of six operations |
| [`pem-api/`](pem-api) | PEM Encodings in Java (JEP 538/542): Read and Write Keys and Certificates Without BouncyCastle | `PEMDecoder`/`PEMEncoder` round trips, JWT signing (RS256/ES256/EdDSA) and a TLS server built from PEM files, encrypted PKCS#8 keys, the failure catalogue (wrong target class, SEC1 `EC PRIVATE KEY`, CRLF output), BouncyCastle and Spring Security `RsaKeyConverters` side by side, preview flag on JDK 27 vs the JDK 28 EA build |
| [`structured-concurrency-final/`](structured-concurrency-final) | Structured Concurrency Is Final in JDK 28 (JEP 543): From Preview to Production | the thread leak of `ExecutorService` and its fix, every built-in `Joiner`, structure violations, timeouts, a custom joiner, JSON thread dumps, scoped values, `javap` diffs of the API on JDK 25, 26, 27 and 28-ea, the compiler output for six pieces of 25/26-era code, and the preview class-file trap between 27 and 28 |
## Captured output (`docs/output/`)