Get jar version in runtime

Question

I'm wondering if it is possible to retrieve, in runtime, a version number of a jar from which the class comes from?

I know its possible to find jar from which the class comes from:

MyClass.class.getProtectionDomain().getCodeSource().getLocation().getPath(); 

but what about a version?

(assuming its not in the file name:) )

Answer 1

Try this, it may be helpful:

String s = new String(); System.out.println(s.getClass().getPackage().getSpecificationVersion()); System.out.println(s.getClass().getPackage().getImplementationVersion()); 

Output:

1.7 1.7.0_25 

Answer 2

import javax.mail.internet.InternetAddress;  /** Display package name and version information for javax.mail.internet. */ public final class ReadVersion {   public static void main(String... aArgs){     ReadVersion readVersion = new ReadVersion();     readVersion.readVersionInfoInManifest();   }    public void readVersionInfoInManifest(){     InternetAddress object = new InternetAddress();     Package objPackage = object.getClass().getPackage();     //examine the package object      String name = objPackage.getSpecificationTitle();     String version = objPackage.getSpecificationVersion();     //some jars may use 'Implementation Version' entries in the manifest instead     System.out.println("Package name: " + name);     System.out.println("Package version: " + version);   } }