Reputation: 4891

Can values defined in MANIFEST.MF be accessed programmatically?

Can I access the values defined in a java manifest from code?

Upvotes: 13

Answers (5)

trashgod

Reputation: 205775

Here's a simple example of reading the main attributes from a JAR's manifest in situ. It's handy for checking up on what's actually there. In outline,

var jar = new JarFile(name);
var manifest = jar.getManifest();
var map = manifest.getMainAttributes();
map.entrySet().forEach(e -> {
    System.out.println(e.getKey()
        + ": " + e.getValue());
});

Upvotes: 5

yegor256

Reputation: 105043

Try com.jcabi.manifests.Manifests utility class from jcabi-manifests. Using this class you can read all available MANIFEST.MF files with one liner:

String name = Manifests.read("Foo-Name");

Also, see this article: http://www.yegor256.com/2014/07/03/how-to-read-manifest-mf.html

Upvotes: 0

Swapnil Kotwal

Reputation: 5720

Use following way to detect External Jar/SDK MANIFEST.MF Info. We could use this info for detecting Jar version etc. Use http://docs.oracle.com/javase/6/docs/api/java/util/jar/Manifest.html

  public void getSDKInfo() {
    Package pkg = Manifest.class.getPackage();
    String specTitle = pkg.getSpecificationTitle();
    String vendor = pkg.getSpecificationVendor();
    String version = pkg.getSpecificationVersion();
   }

Upvotes: 4