Pin Java version to 1.8.0_312 for Spring Data 2.x.

Closes #200

release-tools/src/main/java/org/springframework/data/release/io/JavaRuntimes.java

@@ -52,7 +52,8 @@ import com.dd.plist.XMLPropertyListParser;
  */
 public class JavaRuntimes {
 
-	private static final List<JdkDetector> DETECTORS = Arrays.asList(new SDKmanJdkDetector(), new MacNativeJdkDetector());
+	private static final List<JdkDetector> DETECTORS = Arrays.asList(new SDKmanJdkDetector(), new MacNativeJdkDetector(),
+			new JavaHomeJdkDetector());
 	private static final Lazy<List<JdkInstallation>> JDKS = Lazy.of(() -> {
 
 		List<JdkInstallation> jdks = DETECTORS.stream().flatMap(it -> it.detect().stream()).sorted()
@@ -179,6 +180,28 @@ public class JavaRuntimes {
 		}
 	}
 
+	/**
+	 * Detector using the {@code java.home} system property.
+	 */
+	static class JavaHomeJdkDetector implements JdkDetector {
+
+		private static final File javaHome = new File(System.getProperty("java.home"));
+		private static final String javaVersion = System.getProperty("java.version");
+		private static final String javaVendor = System.getProperty("java.vendor");
+
+		@Override
+		public boolean isAvailable() {
+			return javaHome.exists() && javaHome.isDirectory();
+		}
+
+		@Override
+		public List<JdkInstallation> detect() {
+
+			return Collections
+					.singletonList(new JdkInstallation(JavaVersion.parse(javaVersion), javaVendor + " " + javaVersion, javaHome));
+		}
+	}
+
 	/**
 	 * Detector using the {@code /usr/libexec/java_home} utility storing Java installations in {@code /Libraries/Java} on
 	 * the Mac.
@@ -218,12 +241,12 @@ public class JavaRuntimes {
 
 				String jvmHomePath = dict.get("JVMHomePath").toJavaObject(String.class);
 				String name = dict.get("JVMName").toJavaObject(String.class);
-				String version = dict.get("JVMVersion").toJavaObject(String.class).replace('_', '.');
+				String version = dict.get("JVMVersion").toJavaObject(String.class);
 
 				Matcher matcher = VERSION.matcher(version);
 				matcher.find();
 
-				return new JdkInstallation(Version.parse(matcher.group(1)), name, new File(jvmHomePath));
+				return new JdkInstallation(JavaVersion.parse(matcher.group(1)), name, new File(jvmHomePath));
 
 			}).collect(Collectors.toList());
 		}

release-tools/src/main/java/org/springframework/data/release/model/JavaVersion.java

@@ -27,12 +27,20 @@ import java.util.function.Predicate;
 @Value(staticConstructor = "of")
 public class JavaVersion {
 
-	public static final JavaVersion JAVA_8 = of("Java 1.8",
-			version -> version.getMajor() == 1 && version.getMinor() == 8);
+	public static final JavaVersion JAVA_8 = of("1.8.0_312");
 
 	public static final JavaVersion JAVA_17 = of("Java 17", version -> version.getMajor() == 17);
 
 	String name;
 	Predicate<Version> versionDetector;
 
+	public static JavaVersion of(String version) {
+		Version expectedVersion = parse(version);
+		return of("Java " + version, candidate -> candidate.is(expectedVersion));
+	}
+
+	public static Version parse(String version) {
+		return Version.parse(version.replace('_', '.'));
+	}
+
 }

release-tools/src/test/java/org/springframework/data/release/io/JavaRuntimesUnitTests.java

@@ -26,7 +26,7 @@ import org.springframework.data.release.model.Version;
  *
  * @author Mark Paluch
  */
-class JdkUtilityTests {
+class JavaRuntimesUnitTests {
 
 	@Test
 	void shouldDiscoverCurrentJavaVersion() {