Project
The JVM implementation inside OpenJDK, responsible for just-in-time compilation, object layout and garbage collection.
Codename One went looking for stack allocation to explain Go's edge and ended up tuning when its collector runs. Three attempts to size the heap allowance from the live set failed because the sweep counters miss live objects.
Reality
JDK 27 drops the automatic fallback to Serial GC on limited hardware. A JVM in a tight container now gets G1 unless an operator asks for something else, and compact object headers move footprint in the same release.
Reality
JEP 527's hybrid key exchange landed as a stable feature on September 15, and the same JDK makes G1 the collector on small machines and cuts every object header to 64 bits. Serial is still one flag away.
Perspective Coverage
4 publishersReality
JEP 543 proposes finalizing structured concurrency without change, but the last of its seven preview rounds is the one arriving in JDK 27 on September 15. Ahead-of-time code compilation sits at the same Candidate stage.
Reality
The non-LTS release is mostly two years of JDK 25 experiments switched on by default, and the flipped defaults change memory and handshake behaviour in small containers rather than adding syntax anyone will write.
Reality