[jira] [Created] (MNG-6434) Cannot specify empty string for configuration value

["Chris Egerton (JIRA)" <ji...@apache.org>]

Chris Egerton created MNG-6434:
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             Summary: Cannot specify empty string for configuration value
                 Key: MNG-6434
                 URL: https://issues.apache.org/jira/browse/MNG-6434
             Project: Maven
          Issue Type: Bug
          Components: Plugin API
    Affects Versions: 3.5.4
            Reporter: Chris Egerton


We have a MOJO class that involves several user-configured parameters. Some of these parameters have default values that we'd like to use in the event that the user doesn't specify a value for them; however, we'd also like the user to be able to explicitly specify that the parameter should _not_ have a value. The approach we wanted to take was to specify default values in the parameter's annotation:

{{@Parameter(property = "foo.bar", defaultValue = "${project.scm.url}")}}
{{private String foo;}}

And then detect empty strings as the user's way of saying "I know there's a default value for this parameter but I'm sure that I'd actually like it to be empty anyways.":

{{<configuration>}}
{{  <foo></foo>}}
{{</configuration>}}

or

{{<configuration>}}
{{  <foo />}}
{{</configuration>}}

 

However, there's been some trouble as we haven't found a way yet to distinguish between an intentionally-empty string and one that hasn't been specified at all; the value for foo is always null regardless.

Is there a friendly and/or intuitive way for the user to pass an empty string as a parameter value?



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