Parsing JDT:// scheme in Eglot

[Husain Alshehhi <husain@alshehhi.io>]

Hello,

I have not seen anything related to this issue in this mailing list.

I am using eglot with [JDT] for LSP support. It is working, mostly: it is able to locate definitions and help. It is able to find references as well. The issue is that if the definition is in a dependency, eglot does not show the definition.

After investigating the issue, this appears to be because JDT returns paths on the format `jdt://' which eglot is not able to interpret. Eglot takes them as normal files, opens them, which end up to be an empty file (since it does not correspond to a file in the filesystem.)

This appears to be an issue solved in lsp-java by writing some [special parser] for JDT scheme. nvim-jdtls seems to have done [something similar] (I am not certain of this since I do not use nvim.)

How to enable this support in eglot?

I did see a [discussion on github] about warning about this issue in the log, and it refers to [a commit on emacs] and the bug [58790]. My understanding of LSP protocol details is small to understand what is going on here.

Thanks,
Husain


[JDT] <https://github.com/eclipse/eclipse.jdt.ls>

[special parser] <https://github.com/emacs-lsp/lsp-java/blob/c005c2f8d10d1b39cfd1e1a4ebd572fccaff1588/lsp-java.el#L860>

[something similar] <https://github.com/mfussenegger/nvim-jdtls/blob/7bc572fc357d7dec8d3ca620b53e763776472582/lua/jdtls/setup.lua#L225>

[discussion on github] <https://github.com/joaotavora/eglot/pull/854>

[a commit on emacs] <https://github.com/emacs-mirror/emacs/commit/1a2d603bb3>

[58790] <https://lists.gnu.org/archive/html/bug-gnu-emacs/2022-11/msg00055.html>