jsap.registerParameter(opt4);
// check whether the command line was valid, and if it wasn't,
// display usage information and exit.
JSAPResult config = jsap.parse(args);
if (!config.success()) {
for (java.util.Iterator errs = config.getErrorMessageIterator(); errs.hasNext();) {
System.err.println("Error: " + errs.next());
}
displayHelp(config, jsap);
return;