javamavenmojo

How to make a Maven plugin Mojo parameter's default value an empty string?

How can a Maven plugin Mojo parameter be configured so that the default value is an empty String?

The defaultValue property of the Parameter annotation already defaults to "", so configuring the parameter like @Parameter(defaultValue = "") is equivalent to not configuring it at all.

This does not work and produces a null value at runtime:

    @Parameter(defaultValue = "")
    public String myParam;
Solution

  • The field can be initialized with an empty string to avoid a null value at runtime, while still allowing the user to override it:

        @Parameter
    public String myParam = "";

    The only caveat appears to be that this will not appear in documentation generated by the site plugin as a default value