Java's Project Valhalla finally lands a preview in JDK 28

Oracle software engineer Lois Foltan has confirmed that Java Enhancement Proposal 401 for Value Classes and Objects – part of Project Valhalla – will be integrated into the OpenJDK mainline early next month, targeting JDK 28. Previews of JEP 401 have so far been available only in early-access builds. The current JDK (Java Development Kit) is 26, with JDK 27 expected in September and JDK 28 in March 2027.