Java Utililty Methods Jar Manifest

final JarFile jarFile = new JarFile(jarFileName);
final Manifest manifest = getManifest(jarFile);
jarFile.close();
return manifest;

try {
    return pluginJarFile.getManifest();
} catch (IOException ex) {
    return null;

Manifest mf = new Manifest();
mf.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
mf.getMainAttributes().put(new Attributes.Name("Built-By"), "Sonet Nicolas");
mf.getMainAttributes().put(new Attributes.Name("Created-By"), "Sonet Nicolas");
mf.getMainAttributes().put(Attributes.Name.MAIN_CLASS, className);
return mf;

File jar = new File(path);
JarFile jf = new JarFile(new File(path));
Manifest mf = new JarFile(jar).getManifest();
jf.close();
return mf;

ZipEntry entry = zip.getEntry("META-INF/MANIFEST.MF");
if (entry == null)
    return null;
InputStream in = zip.getInputStream(entry);
try {
    return new Manifest(in);
} finally {
    in.close();
...

ZipEntry manifestEntry = zipFile.getEntry(MANIFEST);
return new Manifest(zipFile.getInputStream(manifestEntry));

try {
    Manifest manifest = new Manifest(in);
    Attributes attributes = manifest.getMainAttributes();
    return attributes.getValue(attr);
} catch (IOException ex) {
    throw new UncheckedIOException(ex);

String value = null;
if (m != null) {
    value = m.getMainAttributes().getValue("Cytoscape-Plugin");
return value;

JarFile jar = new JarFile(jarUrl);
Attributes attr = jar.getManifest().getMainAttributes();
String value = attr.getValue(attribute);
jar.close();
return value;

Hashtable<String, String> h = new Hashtable<String, String>();
JarFile jar = null;
try {
    jar = new JarFile(jarFile);
    Manifest manifest = jar.getManifest();
    h = getManifestAttributes(manifest);
} catch (Exception ex) {
    h = null;
...