JEP 544: Ahead-of-Time Code Compilation

JEP 544 proposes extending HotSpot's AOT cache to store optimized native code compiled during a training run, so that production runs can load already-optimized code instantly instead of relying solely on interpretation and JIT compilation. This combines AOT startup benefits with JIT's ability to deoptimize and reoptimize as workloads change. It builds on JEP 483 (class loading/linking in the AOT cache, JDK 24) and JEP 515 (AOT profiling, JDK 25). Benchmarks show startup improvements of roughly 65-80% and significant warmup-time gains. The feature requires no application code changes, targets AArch64 and x64 initially, and supports Serial, Parallel, G1, and ZGC collectors. AOT code falls back to JIT when CPU features, architecture, or GC choice differ between training and production runs.

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