[jira] [Created] (CLI-302) More user-friendly error handling for missing required arguments

[rkrisztian (Jira)]

rkrisztian created CLI-302:
------------------------------

             Summary: More user-friendly error handling for missing required 
arguments
                 Key: CLI-302
                 URL: https://issues.apache.org/jira/browse/CLI-302
             Project: Commons CLI
          Issue Type: Bug
          Components: CLI-1.x
    Affects Versions: 1.4
            Reporter: rkrisztian


Currently when I specify a flag that requires an argument, but I actually don't 
specify that argument, I get the usage plus an exception. It would be nicer for 
the user if the exception did not happen:

{noformat}
$ myCliApp -a
error: Missing argument for option: a
usage: [options]
Options:
 -a,--argument <arg>   specify this argument
Exception in thread "main" java.lang.NullPointerException: Cannot invoke method 
hasOption() on null object
        at 
org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91)
        at 
org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:47)
        at 
org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
        at 
org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:34)
        at 
org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
        at 
org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:115)
        at 
org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:127)
        at 
groovy.cli.commons.CliBuilder.processSetAnnotation(CliBuilder.groovy:561)
{noformat}

And I cannot control this because I just call:

{code:none}
cli.parseFromInstance options, args
{code}

Thanks in advance.



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