/**
* add "Class-Path: xx.jar" to MANIFEST.MF<br/>
* add "MainClass: xx"
*/
private void extraManifest() {
ManifestConfiguration manifest = super.archive.getManifest();
PropertyUtil.setProperty(manifest, "addClasspath", true);
PropertyUtil.setProperty(manifest, "classpathPrefix", classpathPrefix);
if(mainClass != null) {
if(!bootable) {
PropertyUtil.setProperty(manifest, "mainClass", mainClass);