Allopen IDEA plugin

Is there an allopen plugin for IDEA? I’ve found one for maven, but IDEA shows an error on configuration classes not marked as open, so I guess I need another plugin for IDEA itself, but I can’t find it

If you mean the official one, it is a compiler plugin which means the they will become open after the code is compiled, so you won’t see them as open in IDEA.

Disclaimer: This is what I believe is true, may be I am wrong.