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Sealed, evaluated, verifiable. Categories follow what packs measurably do.
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The Java standard library's actual API surface, disassembled from the local JDK with javap: exact method signatures for the sixty classes agent code touches most — collections, streams, files, HTTP client, time, concurrency — correct by construction, never from memory. Complements yantrik/java-modern (idioms and style) with ground truth aimed at the measured failure mode of local models: invented methods and wrong signatures.
Java as it is written on a current LTS, not as it was written in 2014. Records, sealed types and pattern matching; virtual threads and what still pins them; the concurrency and equality contracts that fail silently; java.time, BigDecimal and the numeric traps; and the JDK APIs that are insecure by default until you configure them.
YantrikDB