Java 27 gets updates only until March 2027. Java 25 LTS gets Oracle Premier Support until September 2030, so moving to 27 means upgrading again within six months.
Java 27's best performance feature, compact object headers, works on Java 25 today with `-XX:+UseCompactObjectHeaders`.
Oracle JDK 21 updates from the October 2026 quarterly patch move to a license that is free only for personal and development use, so teams on 21 should plan the move to 25.