That being said, as an implementor I'm finding cases where LSP's feature set is underdeveloped. For example, there is nothing in the spec to account for renaming files, so I can't put in my rename action without the behavior being incorrect (because if you rename a class in Java you have to rename the corresponding file, which IDEA handles). Also some things require custom LSP requests, like getting the list of build configurations to run. I think this is a product of the Java support in IDEA being so much more comprehensive than anything in LSP so far. But hopefully as the spec is improved these issues will be worked out
https://github.com/Ruin0x11/intellij-lsp-server
That being said, as an implementor I'm finding cases where LSP's feature set is underdeveloped. For example, there is nothing in the spec to account for renaming files, so I can't put in my rename action without the behavior being incorrect (because if you rename a class in Java you have to rename the corresponding file, which IDEA handles). Also some things require custom LSP requests, like getting the list of build configurations to run. I think this is a product of the Java support in IDEA being so much more comprehensive than anything in LSP so far. But hopefully as the spec is improved these issues will be worked out