Question: I have a maven project. Whenever I try to open it in IDEA, all plugins are shown twice in the tree. I have tried restart, invalidate caches / restart, checkout project again, clear .m2 folder, checking maven settings file. 

[![enter image description here](https://i.stack.imgur.com/6PikP.png)](https://i.stack.imgur.com/6PikP.png)

IntelliJ IDEA 2019.3.2 ( Community Edition )
Build #IC-193.6015.39, built on January 21, 2020

Runtime version: 11.0.5+10-b520.30 amd64

I couldn't find any solution. Thanks for help.

Answer: 
There are three immediate things that you could try, that could help:

1. Reimport the maven project. IntelliJ tries to parse your pom and build an object model based on the information found in the pom. There is a button that looks like two arrows that form a circle in the maven tab.
2. Close the project and open up the pom.xml again (its important, not the .idea or something, but a pom.xml). It will offer you to delete the current definitions and create new. Do it and it will rebuild everything.
3. `File --> Invalidate Caches --> Restart`. It will invalidate intelliJ caches (obviously) and restart the IDE.
1. Close your project from File menu. `File--> close project`
2. Go to your project directory and delete `.idea` and any file with extension `.iml`
3. Right-click on your pom and open it with IntelliJ or reimport your project from IntelliJ.