HHH-15107 Use net.bytebuddy.experimental=true when running tests agai…

…nst JDK19

gradle/java-module.gradle

@@ -348,7 +348,13 @@ test {
 
 // Enable the experimental features of ByteBuddy with JDK 19+
 test {
-	if ( gradle.ext.javaVersions.test.release.asInt() >= 19 ) {
+	// We need to test the *launcher* version,
+	// because some tests will use Mockito (and thus Bytebuddy) to mock/spy
+	// classes that are part of the JDK,
+	// and those classes always have bytecode matching the version of the launcher.
+	// So for example, when using a JDK19 launcher and compiling tests with --release 17,
+	// Bytebuddy will still encounter classes with Java 19 bytecode.
+	if ( gradle.ext.javaVersions.test.launcher.asInt() >= 19 ) {
 		logger.warn( "The version of Java bytecode that will be tested is not supported by Bytebuddy by default. " +
 				 " Setting 'net.bytebuddy.experimental=true'." )
 		systemProperty 'net.bytebuddy.experimental', true