In the meantime, it might be worth checking up on the differences between the PosixParser and GnuParser, one of them (posix I think) will take the string "-time" and burst it into "-t -i -m -e" before parsing. This seems to be related to the DateApp issue you are seeing, and I suspect the ant example uses that alternative parser. Either way, the error message is misleading at best.
Rob
Dennis Lundberg wrote:
I have used the examples at
http://jakarta.apache.org/commons/cli/usage.html
to learn commons-cli. They do a good job at introducing new users to the functionality of commons-cli.
There was one thing that was not clear to me when I read the examples or source. Here is a slightly modified version of the DateApp example from the URL above.
--- Start code --- public class DateApp { public static void main(String[] args) { // create Options object Options options = new Options();
// add t option options.addOption("time", false, "display current time");
CommandLineParser parser = new PosixParser();
try { CommandLine cmd = parser.parse(options, args);
if(cmd.hasOption("time")) {
System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
}
else {
System.out.println(new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
}
}
catch(ParseException exp) {
// oops, something went wrong
System.err.println("Parsing failed. Reason: " + exp.getMessage());
}
}
}
--- End code ---
If I try > java DateApp it prints the date as expected
If I try > java DateApp -t it just prints the date
If I try > java DateApp -time it fails with this error: "Parsing failed. Reason: Unrecognized option: -t"
Now to the question:
Is a single-hyphen-option like "-help" not allowed to have more than one character after the hyphen? If that is the case then the Ant example in the usage document does not work.
-- Dennis Lundberg
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