Project Panama - Foreign Function & Memory API
summary
Project Panama provides a Java-first Foreign Function & Memory API previewed in JDK 21 and planned final for JDK 22, offering MemorySegment + Arena for deterministic, confined off‑heap allocation, a MemoryLayout/VarHandle model to avoid manual offsets, and a Linker + function descriptors/jextract to create downcalls and callbacks without JNI shims. Benchmarks show microsecond-scale parity (0.3 ns difference) and overall FFM is three times faster than equivalent JNI in some cases. Zero-length segments, reinterpretation with cleanup, and restricted methods (requires command-line enable) are implemented and already power Lucene/Tomcat builds.
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