Ensure that jar verification runs on JDK 25

This commit ensures that the JAR verification task runs on JDK 25 as
this feature has been introduced in https://bugs.openjdk.org/browse/JDK-8355940

Fixes gh-35777
See gh-35773

buildSrc/src/main/java/org/springframework/build/multirelease/MultiReleaseJarPlugin.java

@@ -30,6 +30,7 @@ import org.gradle.api.tasks.TaskContainer;
 import org.gradle.api.tasks.TaskProvider;
 import org.gradle.api.tasks.bundling.AbstractArchiveTask;
 import org.gradle.jvm.tasks.Jar;
+import org.gradle.jvm.toolchain.JavaLanguageVersion;
 import org.gradle.jvm.toolchain.JavaToolchainService;
 
 /**
@@ -62,8 +63,10 @@ public class MultiReleaseJarPlugin implements Plugin<Project> {
 				tasks,
 				dependencies,
 				objects);
+
 		TaskProvider<MultiReleaseJarValidateTask> validateJarTask = tasks.register(VALIDATE_JAR_TASK_NAME, MultiReleaseJarValidateTask.class, (task) -> {
 			task.getJar().set(tasks.named("jar", Jar.class).flatMap(AbstractArchiveTask::getArchiveFile));
+			task.getJavaLauncher().set(task.getJavaToolchainService().launcherFor(spec -> spec.getLanguageVersion().set(JavaLanguageVersion.of(25))));
 		});
 		tasks.named("check", task -> task.dependsOn(validateJarTask));
 	}

buildSrc/src/main/java/org/springframework/build/multirelease/MultiReleaseJarValidateTask.java

@@ -22,19 +22,26 @@ import org.gradle.api.tasks.InputFile;
 import org.gradle.api.tasks.JavaExec;
 import org.gradle.api.tasks.PathSensitive;
 import org.gradle.api.tasks.PathSensitivity;
+import org.gradle.jvm.toolchain.JavaToolchainService;
 
 import java.util.List;
 
+import javax.inject.Inject;
+
 @CacheableTask
 public abstract class MultiReleaseJarValidateTask extends JavaExec {
 
-	@InputFile
-	@PathSensitive(PathSensitivity.RELATIVE)
-	public abstract RegularFileProperty getJar();
 
 	public MultiReleaseJarValidateTask() {
 		getMainModule().set("jdk.jartool");
 		getArgumentProviders().add(() -> List.of("--validate", "--file", getJar().get().getAsFile().getAbsolutePath()));
 	}
 
+	@Inject
+	protected abstract JavaToolchainService getJavaToolchainService();
+
+	@InputFile
+	@PathSensitive(PathSensitivity.RELATIVE)
+	public abstract RegularFileProperty getJar();
+
 }

buildSrc/src/test/java/org/springframework/build/multirelease/MultiReleaseJarPluginTests.java

@@ -126,6 +126,9 @@ public class MultiReleaseJarPluginTests {
 					id 'org.springframework.build.multiReleaseJar'
 				}
 				version = '1.2.3'
+				tasks.withType(JavaCompile).configureEach {
+					options.release = 11
+				}
 				multiRelease { releaseVersions 17 }
 				""");
 		writeClass("src/main/java17", "Main.java", """
@@ -140,7 +143,7 @@ public class MultiReleaseJarPluginTests {
 				""");
 		assertThatThrownBy(() ->runGradle("validateMultiReleaseJar"))
 				.isInstanceOf(UnexpectedBuildFailure.class)
-				.hasMessageContaining("entry: META-INF/versions/17/Main.class, has a class version incompatible with an earlier version");
+				.hasMessageContaining("entry: META-INF/versions/17/Main.class, contains a class with different api from earlier version");
 	}
 
 	private void writeBuildFile(String buildContent) throws IOException {