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https://issues.apache.org/jira/browse/GROOVY-11449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17872339#comment-17872339
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Paul King commented on GROOVY-11449:
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Indeed, if there are no named arguments, Groovy would look for a `foo(Integer
number)` method to call. You can explicitly create such a method and call the
Map-based method with an empty Map. Using a default empty Map will generate
such a method for you.
Did you want to create a PR for this (much appreciated)? Or are you happy for
me to make a change?
> Improve documentation on Named Method Parameters
> ------------------------------------------------
>
> Key: GROOVY-11449
> URL: https://issues.apache.org/jira/browse/GROOVY-11449
> Project: Groovy
> Issue Type: Improvement
> Components: Documentation
> Reporter: Holger Austinat
> Priority: Minor
>
> Section 3.2.2 of the _Groovy Object Orientation_ documentation describes
> named method parameters
> ([http://groovy-lang.org/objectorientation.html#_named_parameters_2]).
> All name parameters are collected in a map, and passed in as first parameter
> to the called method. One corner case is not mentioned, though: when you call
> the method without any named parameter, the map is not created and not passed
> in. Thus, one should make the map optional:
> {code:groovy}
> def foo(Map args=[:], Integer number)
> {code}
> If not optional, one gets a {{{}groovy.lang.MissingMethodException: No
> signature of method{}}}.
> This is a tricky, unintuitive case which should be explicitly mentioned in
> the documentation.
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