RJNI Turns Java Methods Into Native Rust

Field notes

The documented workflow begins with a packaged JAR, applies eligibility checks and several independent protection passes, then emits a Rust-built cdylib connected through JNI. RJNI highlights compatibility boundaries rather than hiding them: interfaces cannot become native methods, and the scanner accounts for reflection-by-name, ServiceLoader, JPMS descriptors, proxy frameworks, and user keep rules. The site claims support for JDK 8 through JDK 26 and describes optional trial and watermark inputs. Decompiler comparisons for CFR and Procyon are marked as coming soon.