Need way to automatically show usage if required params are missing

Currently if you specify help = true in a parameter, exceptions are suppressed. However, you then have to manually check for required parameters not being set.

It would be great if there were a way to prevent exceptions from being thrown on missing required parameters, but print the usage text instead. Maybe in addition to adding help = true to a help parameter, you could also specify usage = true, and if a parameter is missing, even if the help option was not given on the commandline, JCommander could set the help parameter value to true, so that the usage text is displayed?

[cbeust]

How about adding the JCommander instance to the ParameterException?

– Cédric

On Fri, Mar 17, 2017 at 10:35 PM, Luke Hutchison [e-mail] wrote:

The reason the current pattern is problematic is that you don’t have a JCommander reference if the constructor throws an exception, so you can’t call the usage() method if there is a missing parameter, unless there is a help = true parameter. But if there is a help = true parameter, you don’t get built-in required parameter checking. It’s not possible currently to get both built-in required parameter checking and be able to display usage info if there is a missing required parameter.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/cbeust/jcommander/issues/337#issuecomment-287518329, or mute the thread https://github.com/notifications/unsubscribe-auth/AAFoogF0XAyCt8LPTKvLv4q20wob6W_Wks5rm20rgaJpZM4MhTPZ .

[cbeust]

Oops, my mistake. Fixed and deployed in 1.68.