[HELP] How I can add my customize templates with Maven Plugin?

I want to add some Group.java files to support Group Validation，like the following:

@GroupSequence(value = {GroupA.class, GroupB.class, GroupC.class})
public interface Group {
}

so I wanna try to add some new Template to generate Group files, with the following pom.xml, nothing generate.
my pom.xml

                            <templateDirectory>${project.basedir}/resources/JavaSpring</templateDirectory>
                            <files>
                                <modelGroup.mustache>
                                    <templateType>API</templateType>
                                    <destinationFilename>Group.java</destinationFilename>
                                </modelGroup.mustache>
                            </files>

`modelGroup.mustache`:
@GroupSequence(value = {GroupA.class, GroupB.class, GroupC.class})
public interface Group {
}

so how to add my customize templates with Maven Plugin correctly?

Start with the Maven Plugin configuration in the issue's pom.xml and the modelGroup.mustache template. Trace how templateDirectory and files are handled, then verify that the configuration produces Group.java with the requested GroupSequence content.