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Well, actually you can just check whether the extension is there, no need to check whether the plugin is applied

Except that has some additional meaning for your use-case

yeah I think I could just do
`val javaApplicationExtension = project._extensions_.findByType(JavaApplication::class._java_)`

Or of course you wire the main class property from the extension to a property of your task.

so I'm thinking about exposing the prop in my extension but specify default convention (that reads it from `JavaApplication`)