Fail with a useful error message if Gradle is run on JDK < 24

Signed-off-by: Dmytro Nosan <dimanosan@gmail.com>

Author: nosan

buildSrc/build.gradle

@@ -22,10 +22,6 @@ plugins {
 	id "org.jetbrains.dokka" version "2.1.0"
 }
 
-if (!JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_24)) {
-	throw new GradleException("This build requires Java 24 or newer to run, but you are currently using Java ${JavaVersion.current()}")
-}
-
 repositories {
 	mavenCentral()
 	spring.mavenRepositoriesFor("${springFrameworkVersion}")

buildSrc/src/main/java/org/springframework/boot/build/JavaConventions.java

@@ -32,6 +32,7 @@
 import io.spring.javaformat.gradle.SpringJavaFormatPlugin;
 import io.spring.javaformat.gradle.tasks.CheckFormat;
 import io.spring.javaformat.gradle.tasks.Format;
+import org.gradle.api.GradleException;
 import org.gradle.api.JavaVersion;
 import org.gradle.api.Project;
 import org.gradle.api.Task;
@@ -249,6 +250,14 @@ private void configureJavaConventions(Project project) {
 			}
 			args.addAll(Arrays.asList("-Werror", "-Xlint:unchecked", "-Xlint:deprecation", "-Xlint:rawtypes",
 					"-Xlint:varargs"));
+			compile.doFirst((task) -> {
+				JavaVersion version = JavaVersion.current();
+				if (!version.isCompatibleWith(JavaVersion.VERSION_24)) {
+					throw new GradleException("This build requires at least Java version 24 due to a JDK compiler bug"
+							+ " that breaks JSpecify nullability analysis. Your current Java version is %s."
+								.formatted(version));
+				}
+			});
 		});
 	}