* @param jarfile involved jarfile; can be null
* @return created/updated package
*/
public PyJavaPackage makeJavaPackage(String name, String classes,
String jarfile) {
PyJavaPackage p = this.topLevelPackage;
if (name.length() != 0)
p = p.addPackage(name, jarfile);
if (classes != null)
p.addPlaceholders(classes);
return p;
}