In case someone is interested to know if a plugin can be written in (pure) Java instead Groovy, here you can find a toy I'm working on Don't pay so much attention to the "business logic" (factories, functions, ...) but how you can implement them in Java https://jorgeaguileraseqera.github.io/nf-biojava

Since Groovy can use any Java-based classes anyway, would you say that there is a huge advantage to doing so?

The aim of the plugin is to serve as an example for people dont want/know Groovy but only java