MetaInf metaInf = opts.getMetaInf();
if (metaInf == null) {
metaInf = new DefaultMetaInf();
}
JarExporter exporter = new JarExporter(out);
exporter.open();
exporter.setProperties(metaInf.getProperties());
ProgressTracker tracker = null;
if (opts.getListener() != null) {
tracker = new ProgressTracker();
exporter.setVerbose(opts.getListener());