Add support to detect installed Java versions using Mac native and SDKman.

Closes #196

src/test/java/org/springframework/data/release/io/JdkUtilityTests.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.release.io;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.data.release.model.Version;
+
+/**
+ * Unit tests for {@link JavaRuntimes}.
+ *
+ * @author Mark Paluch
+ */
+class JdkUtilityTests {
+
+	@Test
+	void shouldDiscoverCurrentJavaVersion() {
+
+		Version currentVersion = Version.parse(System.getProperty("java.version").replace('_', '.'));
+		JavaRuntimes.JdkInstallation jdk = JavaRuntimes.getJdk(it -> it.getVersion().is(currentVersion));
+
+		assertThat(jdk).isNotNull();
+		assertThat(System.getProperty("java.home")).contains(jdk.getHome().getPath());
+	}
+}