private String calculateManifest(String projectVersion, File jar) {
        def bundleVersion = getBundleVersion(projectVersion)
        def qualifier = new Date().format('yyyyMMddkkmm')
        def packageNames = getPackageNames(jar)
        def packageExports = getPackageExports(packageNames, bundleVersion)
     """Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Gradle Tooling API
Bundle-Vendor: Gradle Inc.

    }

    private static HashCode calculateFilterSpecHash(FilteringClassLoader.Spec spec) {
        Hasher hasher = Hashing.newHasher();
        addToHash(hasher, spec.getClassNames());
        addToHash(hasher, spec.getPackageNames());
        addToHash(hasher, spec.getPackagePrefixes());
        addToHash(hasher, spec.getResourcePrefixes());
        addToHash(hasher, spec.getResourceNames());
        addToHash(hasher, spec.getDisallowedClassNames());

        encodeStrings(encoder, spec.getDisallowedClassNames());
        encodeStrings(encoder, spec.getPackagePrefixes());
        encodeStrings(encoder, spec.getDisallowedPackagePrefixes());
        encodeStrings(encoder, spec.getPackageNames());
        encodeStrings(encoder, spec.getResourceNames());
        encodeStrings(encoder, spec.getResourcePrefixes());
    }

    private void encodeStrings(Encoder encoder, Set<String> strings) throws Exception {

                ^ classNames.hashCode()
                ^ disallowedClassNames.hashCode()
                ^ disallowedPackagePrefixes.hashCode();
        }

        public Set<String> getPackageNames() {
            return packageNames;
        }

        public Set<String> getPackagePrefixes() {
            return packagePrefixes;
        }

        public Set<String> getResourcePrefixes() {