Branding build version into manifest and retrieving with Package.getSpecificationVersion

Thu Sep 25 16:14:00 CDT 2008

You would expect this to be straight forward but it isn't quite all there. Even then, there is a slew of bugs in the Sun Java bug parade that are worth looking at.

  1. the Implementation-XXX and Speicification-XXX must be in a section for the package
  2. the section name is slash separated and MUST have a trailing slash.
  3. some of the docs and specs reference Package-XXX but we don't see this "manifesting" itself (nyuck nyuck nyuck).

Here is the example code build.xml for ant 

      <attribute name="Implementation-Title" value="proof impl" />
      <attribute name="Implementation-Version" value="1.2.3" />
      <attribute name="Implementation-Vendor" value="implvendor " />
      <attribute name="Specification-Title" value="spec title" />
      <attribute name="Specification-Version" value="1.2.4" />
      <attribute name="Specification-Vendor" value="spec vendor" />
    </section>
  </manifest>
</jar>

And here is our test class package net.skelter.mfproof;

public class App { public static void main(String[] args){ Package pkg = App.class.getPackage(); System.out.println("Package = " + pkg); System.out.println("Impl:"); System.out.println("Version: " + pkg.getImplementationVersion()); System.out.println("Vendor: " + pkg.getImplementationVendor()); System.out.println("Title: " + pkg.getImplementationTitle()); System.out.println("Spec:"); System.out.println("Version: " + pkg.getSpecificationVersion()); System.out.println("Vendor: " + pkg.getSpecificationVendor()); System.out.println("Title: " + pkg.getSpecificationTitle()); } }

And, the output

Package = package net.skelter.mfproof, spec title, version 1.2.4
Impl:
Version: 1.2.3
Vendor: implvendor
Title: proof impl
Spec:
Version: 1.2.4
Vendor: spec vendor
Title: spec title