Summary

Update core libraries for JDK 27 by adding an enum constant to ClassFileFormatVersion and a constant to ClassFile.

Problem

With a new release, ClassFileFormatVersion and ClassFile need constants to model that release.

Solution

Add the new constants. As a consequence of defining new constants, the behavior of the ClassFile.latestMajorVersion() and ClassFileFormatVersion.latest() methods is updated accordingly.

Specification

diff --git a/src/java.base/share/classes/java/lang/classfile/ClassFile.java b/src/java.base/share/classes/java/lang/classfile/ClassFile.java
--- a/src/java.base/share/classes/java/lang/classfile/ClassFile.java
+++ b/src/java.base/share/classes/java/lang/classfile/ClassFile.java
@@ -1038,6 +1038,14 @@
      */
     int JAVA_26_VERSION = 70;

+    /**
+     * The class major version introduced by Java SE 27, {@value}.
+     *
+     * @see ClassFileFormatVersion#RELEASE_27
+     * @since 27
+     */
+    int JAVA_27_VERSION = 71;
+
     /**
      * A minor version number {@value} indicating a class uses preview features
      * of a Java SE release since 12, for major versions {@value
@@ -1049,7 +1057,7 @@
      * {@return the latest class major version supported by the current runtime}
      */
     static int latestMajorVersion() {
-        return JAVA_26_VERSION;
+        return JAVA_27_VERSION;
     }

     /**
diff --git a/src/java.base/share/classes/java/lang/reflect/ClassFileFormatVersion.java b/src/java.base/share/classes/java/lang/reflect/ClassFileFormatVersion.java
--- a/src/java.base/share/classes/java/lang/reflect/ClassFileFormatVersion.java 
+++ b/src/java.base/share/classes/java/lang/reflect/ClassFileFormatVersion.java 
@@ -383,6 +383,18 @@
      * <cite>The Java Virtual Machine Specification, Java SE 26 Edition</cite></a>
      */
     RELEASE_26(70),
+
+    /**
+     * The version introduced by the Java Platform, Standard Edition
+     * 27.
+     *
+     * @since 27
+     *
+     * @see <a
+     * href="https://docs.oracle.com/javase/specs/jvms/se27/html/index.html">
+     * <cite>The Java Virtual Machine Specification, Java SE 27 Edition</cite></a>
+     */
+    RELEASE_27(71),
     ; // Reduce code churn when appending new constants

     // Note to maintainers: when adding constants for newer releases,
@@ -398,7 +410,7 @@
      * {@return the latest class file format version}
      */
     public static ClassFileFormatVersion latest() {
-        return RELEASE_26;
+        return RELEASE_27;
     }