psi_cookbook.md: add note about Java setup

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Yann Cébron 2021-01-26 12:12:24 +01:00
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@ -27,6 +27,10 @@ Unlike [Developing Custom Language Plugins](custom_language_support.md), it talk
## Java Specific
> If your plugin depends on Java functionality and targets 2019.2 or later, please make sure to follow the steps from this [blog post](https://blog.jetbrains.com/platform/2019/06/java-functionality-extracted-as-a-plugin/).
>
{type="note"}
### How do I find all inheritors of a class?
`ClassInheritorsSearch.search()`