Help with building executable jar with ant.

[Unnsse Khan]

Hello,

I tried to make an executable jar (a jar file that contains a main method, and once a user clicks on it from WinXP, it launches)...

The following code compiles correctly, but when I click on the jar file, nothing happens... Sorry if this post was supposed to be in a different forum other than the one for ant.

<target name = "deploy" depends="compile" description = "Setting up deployment package.">
<echo>Preparing deployment package...</echo>
<echo/>
<mkdir dir = "${deploy.dir}" />
<jar jarfile="${deploy.dir}/HelloWorld.jar" basedir="${build.dir}">
      <manifest>
<attribute name="Main-Class" value="hello.HelloWorld"/>
      </manifest>
</jar>
<echo>HelloWorld jar successfully created.</echo>
  </target> 

[Ilja Preuss]

Did you take a look at the manifest file from the created jar file?

[Unnsse Khan]

Yes, I did... I extracted the jar file and found a META-INF directory which contained a MANIFEST.MF file...

The MANIFEST.MF file's contents were:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.1
Created-By: 1.4.2_06-b03 (Sun Microsystems Inc.)
Main-Class: hello.HelloWorld

Is this correct? How do I invoke an executable jar from the command line and/or ant target?

Many, many thanks!

All the best,

[Ilja Preuss]

That looks correct. If I remember correctly, though, the file needs to have *two empty lines at the end* (that is, after Main-Class entry). You should check for that...