} finally {
            zipFile.close()
        }
    }

    @Override
    def hasDescendants(String... relativePaths) {
        String[] allDescendants = relativePaths + JarFile.MANIFEST_NAME
        return super.hasDescendants(allDescendants)
    }

    JavaVersion getJavaVersion() {
        JarFile jarFile = new JarFile(file)
        try {
            //take the first class file

        def confCacheDir = file("./app/.gradle/configuration-cache")
        confCacheDir.isDirectory()
        def confCacheFiles = confCacheDir.allDescendants().findAll { it != 'configuration-cache.lock' && it != 'gc.properties' }
        confCacheFiles.size() == 5 // header, 2 * fingerprint, root build state file, included build state file