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There's a good one for IntelliJ called IdeaVim.

I tried solutions for Eclipse back when I used it, but I couldn't find one that I liked.

When I was using eclipse, I found VRapper[0] a decent enough vim plugin. I also agree with you about IdeaVim, it's a good vim, and it's been open-sourced[1].

[0]: http://vrapper.sourceforge.net/home/

[1]: https://github.com/JetBrains/ideavim

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