def fingerprints = collectFingerprints(strategy)
        expect:
        fingerprints[jarFile1]                      == jarFile1.name
        fingerprints[jarFile2]                      == jarFile2.name
        fingerprints[resources]                     == null
        fingerprints[resources.file(fileInRoot)]    == fileInRoot

    private Module loadOptionalModule(final String moduleName) {
        File jarFile = findJar(moduleName, jarFile1 -> hasModuleProperties(moduleName, jarFile1));
        if (jarFile != null) {
            Set<File> implementationClasspath = new LinkedHashSet<>();
            implementationClasspath.add(jarFile);
            Properties properties = loadModuleProperties(moduleName, jarFile);

            return null;
        }
        JarFile jarFile;
        try {
            jarFile = new JarFile(possibleJarFile);
        } catch (ZipException e) {
            // Not a zip file
            return null;
        }
        try {
            return jarFile.getManifest();
        } finally {
            jarFile.close();
        }
    }

public class JarFilePackageLister {
    public void listJarPackages(File jarFile, JarFilePackageListener listener) {
        if (jarFile == null) {
            throw new IllegalArgumentException("jarFile is null!");
        }

        final String jarFileAbsolutePath = jarFile.getAbsolutePath();

        if (!jarFile.exists()) {
            throw new IllegalArgumentException("jarFile doesn't exists! (" + jarFileAbsolutePath + ")");
        }

    def jarFile = tmpDir.file("mydir/jarfile.jar").createFile()

    def "creates manifest classpath with relative urls"() {
        when:
        def classpathFiles = [tmpDir.file('mydir/jar1.jar'), tmpDir.file('mydir/nested/jar2.jar')]

        then:
        ManifestUtil.createManifestClasspath(jarFile, classpathFiles) == "jar1.jar nested/jar2.jar";
    }

import java.io.IOException;
import java.util.jar.JarFile;

/**
 * Compatibility wrapper for multi-release JARs that can be used on Java 8 too.
 */
abstract class JarCompat implements Closeable {
    public static final boolean JAVA_9_COMPATIBLE = JavaVersion.current().isJava9Compatible();

    protected final JarFile jarFile;

    private JarCompat(JarFile jarFile) {
        this.jarFile = jarFile;
    }

        assertArgumentNotNull("jarFile", jarFile);

        try {
            jarFile.close();
        } catch (final IOException e) {
            logger.log(format("ECL0017", e.getMessage()), e);
        }
    }

        and:
        file("b/build/classes/java/main/b/B.class").delete()
        def jarFile = file("b/build/libs/b.jar")
        jarFile.isFile()

        and:
        configurationCacheRun "clean"

        and:
        configurationCacheRun ":b:assemble"

        then:
        new ZipTestFixture(jarFile).assertContainsFile("b/B.class")
    }

    }

    private static boolean findMarkerFileInJar(File jar) {
        JarFile jarFile = null;

        try {
            jarFile = new JarFile(jar);
            JarEntry markerFile = jarFile.getJarEntry(MARKER_FILENAME);

            if (markerFile != null) {
                return true;
            }
        } catch (IOException e) {

        createJar(classGraph, classesDir, manifestFile, jarFile)

        return jarFile
    }

    private
    fun createJar(classGraph: ClassGraph, classesDir: File, manifestFile: File, jarFile: File) {
        try {
            JarOutputStream(BufferedOutputStream(FileOutputStream(jarFile))).use { jarOutputStream ->
                if (manifestFile.exists()) {