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Add classfile-api module: java.lang.classfile (JEP 484) parse, generate, transform with timing instrumentation, ASM 9.11.1 comparison, version limits, JDK 24/25/26 API diff

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
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asmhatre
2026-10-29 04:14:57 +00:00
co-authored by Claude Sonnet 5.5
parent eca73ad544
commit 41101bea40
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README.md
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@@ -73,6 +73,7 @@ These modules keep only sources, a `run.sh` and their transcripts (`output/`). T
| [`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 |
| [`kdf/`](kdf) | Key Derivation Function API in Java (JEP 510): HKDF Explained with Real Examples | `javax.crypto.KDF` final in JDK 25, `HKDF-SHA256/384/512`, extract vs expand, RFC 5869 vectors asserted, a hand-written HKDF and 300 generated cases compared with Python `cryptography` and `openssl kdf`, per-tenant keys with length-prefixed `info`, and the mistakes reproduced (same `info`, ambiguous concatenation, PIN through HKDF vs PBKDF2) |
| [`classfile-api/`](classfile-api) | The Java ClassFile API (JEP 484): Read, Generate and Transform Bytecode Without ASM | `java.lang.classfile` final since JDK 24: `parse` and `ClassModel` traversal, `ClassFile.build` with `defineClass` and `defineHiddenClass`, five deliberately broken classes (including swapped exception-table labels that `verify()` misses), timing inserted with `ClassTransform`/`MethodTransform`/`CodeTransform`, the same three jobs in ASM 9.11.1 asserted equal, class-file version limits, a JDK 24/25/26 API diff and a look inside `spring-core` 7.0.10 |
## Captured output (`docs/output/`)