Java Utililty Methods Jar Manifest

if (manifest instanceof IFile) {
    String content = getFileContent((IFile) manifest, "UTF8");
    int index = content.indexOf(entryKey);
    if (index != -1) {
        StringTokenizer st = new StringTokenizer(content.substring(index + entryKey.length()), ";:\r\n");
        return st.nextToken().trim();
return null;

String manifestLocation = new StringBuilder(moduleDir).append(File.separator).append(META_INF_DIR_NAME)
        .append(File.separator).append(MANIFEST_FILE_NAME).toString();
return manifestLocation;

ZipFile zipFile = new ZipFile(aJarFile);
Properties properties = new Properties();
try {
    ZipEntry zipEntry = zipFile.getEntry("META-INF/MANIFEST.MF");
    InputStream is = zipFile.getInputStream(zipEntry);
    properties.load(is);
    is.close();
} catch (Throwable t) {
...

Hashtable<String, String> headers = new Hashtable<String, String>();
Attributes mainatts = manifest.getMainAttributes();
for (Object key : mainatts.keySet()) {
    String name = key.toString();
    String value = mainatts.getValue(name);
    headers.put(name, value);
return headers;
...

List<String> values = new ArrayList<>();
Attributes mainAttribs = manifest.getMainAttributes();
String valueList = mainAttribs.getValue(headerName);
String[] valueArray = valueList != null ? valueList.split(",") : null;
if (valueArray != null) {
    for (String value : valueArray) {
        if (!value.trim().isEmpty()) {
            values.add(value.trim());
...

String manifestFileLocation = getManifestFileLocation(moduleDir);
File manifestFile = new File(manifestFileLocation);
if (!manifestFile.exists()) {
    throw new RuntimeException("The specified Manifest file doesn't exist: " + manifestFileLocation);
return manifestFileLocation;

InputStream is = clContainingManifest.getResourceAsStream("META-INF/MANIFEST.MF");
return readManifestProperty(is, manifestKey);

try (JarFile jarFile = new JarFile(file)) {
    Manifest manifest = jarFile.getManifest();
    Attributes attributes = manifest.getMainAttributes();
    return attributes.getValue(name);

Map<Object, Object> entries = manifest.getMainAttributes();
for (Iterator<Object> it = entries.keySet().iterator(); it.hasNext();) {
    Attributes.Name key = (Attributes.Name) it.next();
    String keyName = key.toString();
    if (propertyName.equals(keyName)) {
        return (String) entries.get(key);
return null;

JarFile jF = null;
try {
    jF = new JarFile(jarFile);
    Manifest mf = jF.getManifest();
    return mf.getMainAttributes().getValue(key);
} finally {
    if (jF != null) {
        jF.close();
...