Class 'Main' is never used

Hi, I'm new to this forum but I've been developing Minecraft plugins for 2 years; exactly 3 days ago I created a new project in IntelliJ IDEA, having the "Minecraft development" plugin installed in the IDE; problems encountered:

- the main class was not found and used anywhere, even if it was created;
- not having found the main class, the button that compiles is blocked and colored in gray, therefore I could never test my project.

Tried and tested solutions:
- Reinstall the IDE;
- Reinstall the plugin "Minecraft development";
- Reinstall Java and the openJDK with the appropriate versions for the project.

I've already contacted IntelliJ IDEA support and those who integrated the "Minecraft development" plugin; basically IntelliJ sent me to their discord asking for support, which in turn sent me here; if I'm here I hope this time to get a result that helps me solve this problem; what can i do to fix this?

 

You've been developing Minecraft plugins for two years, yet don't realize main is not a thing with them? It's weird that your compile button is grey. When you create a new project, it's buildable right from the outset. Are you sure you created the right kind of project? I'd assume you did not.

 

Of course I realized that; I've created the right type of project at least a hundred times but the error keeps repeating; of course it doesn't need the main() method but this was foolishly suggested to me in order to solve the problem; in the end contacting you I forgot to remove it; if it helps, when I create a new project I select the "Plugin", "Bukkit" and "Spigot" typologies as Bukkit platform and as JDK I use "16 Oracle OpenJDK version 16.0.2"; now I have only the only project left and only that works, after all this time I still don't understand what the reason is and I can't proceed with the resolution in any way

Here's a demonstration

And this is the error

 

No "of course" about it; in all the years I've been doing tech support I learned very quickly to never assume competence, lol. It never hurts to check.

Hmm that's bizarre. It is pretty straight forward for me:

The only diff is I have J17, but I cannot imagine that is relevant.