GMavenPlus 1.9.0 has been released.  As mentioned in the release notes
<https://github.com/groovy/GMavenPlus/releases/tag/1.9.0>, this release
includes:
Bugs

None
Enhancements

   - Support for Java 14 (#152
   <https://github.com/groovy/GMavenPlus/issues/152>).
   - Support for Java 15 (#153
   <https://github.com/groovy/GMavenPlus/pull/153>) (will be available in
   Groovy 3.0.3).
   - Add skipBytecodeCheck property and parameter, so if a Java version
   comes out the plugin doesn't recognize, you can use it without having to
   wait for an update.
   - Use *groovy.ant.AntBuilder* instead of *groovy.util.AntBuilder* (if
   available).

Potentially breaking changes

   - maven.groovydoc.skip property was renamed to skipGroovydoc so it
   matches the pattern of the other properties and won't seem to imply it's a
   property for a standard Maven plugin.
   - Using *groovy.ant.AntBuilder* instead of *groovy.util.AntBuilder*
   (when available on classpath).
   - Bundling Ant *1.10.7* instead of *1.10.5*.
   - Bundling Ivy *2.5.0* instead of *2.4.0*.

Notes

   - Now officially requires Java 7 instead of 6. This is not a breaking
   change, however, since this was actually already required because of
   plexus-classworlds. This just wasn't discovered until an enforcer rule was
   added to check bytecode versions of dependencies.

*Getting help / reporting bugs*

As usual, let me know of any bugs you encounter either on our user mailing
list <http://groups.google.com/group/gmavenplus>, GitHub issues
<https://github.com/groovy/GMavenPlus/issues>, or Slack
<https://groovy-community.slack.com/messages/C2SLAV9FY/>.

Enjoy!