diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/NestedJarFileTests.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/NestedJarFileTests.java
index 1944f30b9f..59b3e7cc8f 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/NestedJarFileTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/jar/NestedJarFileTests.java
@@ -352,7 +352,8 @@ class NestedJarFileTests {
 			assertThat(jar.stream().map((entry) -> entry.getName() + ":" + entry.getRealName())).containsExactly(
 					"META-INF/:META-INF/", "META-INF/MANIFEST.MF:META-INF/MANIFEST.MF",
 					"multi-release.dat:multi-release.dat",
-					"META-INF/versions/17/multi-release.dat:META-INF/versions/17/multi-release.dat");
+					"META-INF/versions/%1$d/multi-release.dat:META-INF/versions/%1$d/multi-release.dat"
+						.formatted(TestJar.MULTI_JAR_VERSION));
 		}
 	}
 
@@ -361,7 +362,8 @@ class NestedJarFileTests {
 		try (NestedJarFile jar = new NestedJarFile(this.file, "multi-release.jar", Runtime.version())) {
 			assertThat(jar.versionedStream().map((entry) -> entry.getName() + ":" + entry.getRealName()))
 				.containsExactly("META-INF/:META-INF/", "META-INF/MANIFEST.MF:META-INF/MANIFEST.MF",
-						"multi-release.dat:META-INF/versions/17/multi-release.dat");
+						"multi-release.dat:META-INF/versions/%1$d/multi-release.dat"
+							.formatted(TestJar.MULTI_JAR_VERSION));
 		}
 	}
 
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/launch/ExplodedArchiveTests.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/launch/ExplodedArchiveTests.java
index 96107512a3..b18164f751 100755
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/launch/ExplodedArchiveTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/launch/ExplodedArchiveTests.java
@@ -85,7 +85,7 @@ class ExplodedArchiveTests {
 	}
 
 	@Test
-	void getClassPathUrlsWhenNoPredicartesReturnsUrls() throws Exception {
+	void getClassPathUrlsWhenNoPredicatesReturnsUrls() throws Exception {
 		Set<URL> urls = this.archive.getClassPathUrls(Archive.ALL_ENTRIES);
 		URL[] expectedUrls = TestJar.expectedEntries().stream().map(this::toUrl).toArray(URL[]::new);
 		assertThat(urls).containsExactlyInAnyOrder(expectedUrls);
@@ -123,7 +123,7 @@ class ExplodedArchiveTests {
 			Enumeration<JarEntry> entries = jarFile.entries();
 			while (entries.hasMoreElements()) {
 				JarEntry entry = entries.nextElement();
-				File destination = new File(this.rootDirectory.getAbsolutePath() + File.separator + entry.getName());
+				File destination = new File(this.rootDirectory, entry.getName());
 				destination.getParentFile().mkdirs();
 				if (entry.isDirectory()) {
 					destination.mkdir();
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/testsupport/TestJar.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/testsupport/TestJar.java
index 292fd44b66..efa625e59c 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/testsupport/TestJar.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/testsupport/TestJar.java
@@ -35,21 +35,9 @@ import java.util.zip.ZipEntry;
  */
 public abstract class TestJar {
 
-	private static final int BASE_VERSION = 8;
-
-	private static final int RUNTIME_VERSION;
+	public static final int MULTI_JAR_VERSION = Runtime.version().feature();
 
-	static {
-		int version;
-		try {
-			Object runtimeVersion = Runtime.class.getMethod("version").invoke(null);
-			version = (int) runtimeVersion.getClass().getMethod("major").invoke(runtimeVersion);
-		}
-		catch (Throwable ex) {
-			version = BASE_VERSION;
-		}
-		RUNTIME_VERSION = version;
-	}
+	private static final int BASE_VERSION = 8;
 
 	public static void create(File file) throws Exception {
 		create(file, false);
@@ -120,8 +108,9 @@ public abstract class TestJar {
 		writeManifest(jarOutputStream, "j2", multiRelease);
 		if (multiRelease) {
 			writeEntry(jarOutputStream, "multi-release.dat", BASE_VERSION);
-			writeEntry(jarOutputStream, String.format("META-INF/versions/%d/multi-release.dat", RUNTIME_VERSION),
-					RUNTIME_VERSION);
+			writeEntry(jarOutputStream,
+					String.format("META-INF/versions/%d/multi-release.dat", MULTI_JAR_VERSION),
+					MULTI_JAR_VERSION);
 		}
 		else {
 			writeEntry(jarOutputStream, "3.dat", 3);
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/zip/ZipCentralDirectoryFileHeaderRecordTests.java b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/zip/ZipCentralDirectoryFileHeaderRecordTests.java
index a0a8645e9c..5fe7e9ee88 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/zip/ZipCentralDirectoryFileHeaderRecordTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/zip/ZipCentralDirectoryFileHeaderRecordTests.java
@@ -16,6 +16,8 @@
 
 package org.springframework.boot.loader.zip;
 
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
 import java.util.zip.ZipEntry;
 
 import org.junit.jupiter.api.Test;
@@ -129,7 +131,8 @@ class ZipCentralDirectoryFileHeaderRecordTests {
 		record.copyTo(dataBlock, 0, entry);
 		assertThat(entry.getMethod()).isEqualTo(ZipEntry.DEFLATED);
 		assertThat(entry.getTimeLocal()).hasYear(2007);
-		assertThat(entry.getTime()).isEqualTo(1172356386000L);
+		ZonedDateTime expectedTime = ZonedDateTime.of(2007, 02, 24, 14, 33, 06, 0, ZoneId.systemDefault());
+		assertThat(entry.getTime()).isEqualTo(expectedTime.toEpochSecond() * 1000);
 		assertThat(entry.getCrc()).isEqualTo(0xFFFFFFFFL);
 		assertThat(entry.getCompressedSize()).isEqualTo(1);
 		assertThat(entry.getSize()).isEqualTo(2);