reading MANIFEST.MF file from jar file using JAVA

I would suggest to make following:

Package aPackage = MyClassName.class.getPackage();
String implementationVersion = aPackage.getImplementationVersion();
String implementationVendor = aPackage.getImplementationVendor();

Where MyClassName can be any class from your application written by you.

Next code should help:

JarInputStream jarStream = new JarInputStream(stream);
Manifest mf = jarStream.getManifest();

Exception handling is left for you :)