then:
        noExceptionThrown()
        jarFile1 && jarFile2
        jarFile1.exists() && jarFile2.exists()
        jarFile1 == jarFile2
    }

    def "only generates single JAR in cache when invoked by concurrent threads"() {
        given:
        def jarGenerationInvocations = 10
        def triggeredJarFileGeneration = new AtomicInteger()
        def jarFiles = Collections.synchronizedList(new ArrayList<File>())

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

        given:
        def jarfile = tmpDir.file("test.jar")
        createJarWithAttributes(jarfile, ["Implementation-Version": "1.0.0"])

        def jarfile2 = tmpDir.file("test2.jar")
        createJarWithAttributes(jarfile2, ["Implementation-Version": "1.0.1"])

        def hash1 = zipHasher.hash(snapshotContext(jarfile))
        def hash2 = zipHasher.hash(snapshotContext(jarfile2))

        expect:

            public void receivePackage(String packageName) {
                Set<File> jarFiles = packageJarFilesMappings.get(packageName);
                if (jarFiles == null) {
                    jarFiles = new TreeSet<File>();
                    packageJarFilesMappings.put(packageName, jarFiles);
                }
                jarFiles.add(libraryJar);
            }
        });
    }

    /**

    protected List<String> loadDataStoreNameList() {
        final Set<String> nameSet = new HashSet<>();
        final File[] jarFiles = ResourceUtil.getPluginJarFiles(PluginHelper.ArtifactType.DATA_STORE.getId());
        for (final File jarFile : jarFiles) {
            try (FileSystem fs = FileSystems.newFileSystem(jarFile.toPath(), ClassLoader.getSystemClassLoader())) {
                final Path xmlPath = fs.getPath("fess_ds++.xml");

            }

            verifyTestKitJars {
                doLast {
                    def jarFiles = libsDir.listFiles()
                    def testKitFunctionalJar = jarFiles.find { it.name.startsWith('$GRADLE_TEST_KIT_JAR_BASE_NAME') }
                    assert testKitFunctionalJar

                    def jar = new java.util.jar.JarFile(testKitFunctionalJar)
                    def classFiles
                    try {

            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;
    }