From b9f92100636377a88a609d0db24b1924dfcf136d Mon Sep 17 00:00:00 2001
From: Sergii Tykhomyrov <sergii@tykhomyrov.net>
Date: Sat, 10 Oct 2026 22:10:32 +0200
Subject: nvim: add Java LSP

---
 nvim/dot-config/nvim/init.lua                   |  3 +++
 nvim/dot-config/nvim/lazy-lock.json             |  8 ++++----
 nvim/dot-config/nvim/lua/plugins/lsp.lua        | 21 ++++++++++++++++++++-
 nvim/dot-config/nvim/lua/plugins/treesitter.lua |  3 ++-
 4 files changed, 29 insertions(+), 6 deletions(-)

(limited to 'nvim')

diff --git a/nvim/dot-config/nvim/init.lua b/nvim/dot-config/nvim/init.lua
index 593f28f..99537ce 100644
--- a/nvim/dot-config/nvim/init.lua
+++ b/nvim/dot-config/nvim/init.lua
@@ -36,6 +36,9 @@ vim.api.nvim_create_autocmd("LspAttach", {
     if client and client:supports_method("textDocument/completion") then
       vim.lsp.completion.enable(true, client.id, ev.buf, { autotrigger = true })
     end
+    if client and client:supports_method("textDocument/definition") then
+      vim.keymap.set("n", "gd", vim.lsp.buf.definition, { buffer = ev.buf, desc = "Go to definition" })
+    end
   end,
 })
 
diff --git a/nvim/dot-config/nvim/lazy-lock.json b/nvim/dot-config/nvim/lazy-lock.json
index 10104d0..0f30ae4 100644
--- a/nvim/dot-config/nvim/lazy-lock.json
+++ b/nvim/dot-config/nvim/lazy-lock.json
@@ -2,13 +2,13 @@
   "d2-vim": { "branch": "master", "commit": "a950f1a276506ac4bbc274dd65ba98b15a1d490d" },
   "lazy.nvim": { "branch": "main", "commit": "306a05526ada86a7b30af95c5cc81ffba93fef97" },
   "lush.nvim": { "branch": "main", "commit": "9c60ec2279d62487d942ce095e49006af28eed6e" },
-  "mason-lspconfig.nvim": { "branch": "main", "commit": "77e06f7d2fc127e6ef0a720b59acbc50757cff19" },
+  "mason-lspconfig.nvim": { "branch": "main", "commit": "e17625cdc8c2650787467398e02c5d63a2cde966" },
   "mason.nvim": { "branch": "main", "commit": "2a6940af80375532e5e9e7c1f2fc6319a1b7a69d" },
   "neo-tree.nvim": { "branch": "v3.x", "commit": "1a14083046d96e88e361d1da00761c40d45012f3" },
   "nui.nvim": { "branch": "main", "commit": "10fc361835c856ba4233ef5ea135b919bf3dce97" },
-  "nvim-lspconfig": { "branch": "master", "commit": "ac9d2f7c4757db6320cab6697fe73e5e8adb2457" },
-  "nvim-treesitter": { "branch": "main", "commit": "9a168f6357ed21c3a636e1727bc7d382abc451b8" },
-  "nvim-web-devicons": { "branch": "master", "commit": "5f032a85be210cd1c6ac98861eb3b187ff3bd5eb" },
+  "nvim-lspconfig": { "branch": "master", "commit": "c59fc922f718fa055f69f5f3bc888f23211571eb" },
+  "nvim-treesitter": { "branch": "main", "commit": "1a4f47b03dfe92d28de7d5654c67327ef008c9e6" },
+  "nvim-web-devicons": { "branch": "master", "commit": "58447c1fca354bbf184425e4a8d01deecbd6f3c4" },
   "plenary.nvim": { "branch": "master", "commit": "74b06c6c75e4eeb3108ec01852001636d85a932b" },
   "telescope.nvim": { "branch": "master", "commit": "40aedd8a68c78a656a10a8d62d80c54af59420fb" },
   "zenbones.nvim": { "branch": "main", "commit": "8304d8df9b823ff11e103afa62f38c39f534abe6" }
diff --git a/nvim/dot-config/nvim/lua/plugins/lsp.lua b/nvim/dot-config/nvim/lua/plugins/lsp.lua
index 2b5ca4d..b13402d 100644
--- a/nvim/dot-config/nvim/lua/plugins/lsp.lua
+++ b/nvim/dot-config/nvim/lua/plugins/lsp.lua
@@ -12,11 +12,30 @@ return {
       "neovim/nvim-lspconfig",
     },
     opts = {
-      ensure_installed = { "gopls", "pyright" },
+      ensure_installed = { "gopls", "pyright", "jdtls" },
     },
     config = function(_, opts)
       require("mason-lspconfig").setup(opts)
 
+      -- jdtls needs Java 21+ to launch and prefers JAVA_HOME, which the
+      -- login shell points at JDK 17. Use the sdkman JDK 21 just for jdtls.
+      -- Projects may target older versions, so register the installed JDKs.
+      vim.lsp.config("jdtls", {
+        cmd_env = { JAVA_HOME = vim.fn.expand("~/.sdkman/candidates/java/current") },
+        settings = {
+          java = {
+            configuration = {
+              runtimes = {
+                -- default = runtime for standalone files (HackerRank-style)
+                { name = "JavaSE-17", path = vim.fn.expand("~/.sdkman/candidates/java/17.0.18-tem"), default = true },
+                { name = "JavaSE-21", path = vim.fn.expand("~/.sdkman/candidates/java/21.0.12+1.1-tem") },
+              },
+            },
+          },
+        },
+      })
+      vim.lsp.enable("jdtls")
+
       vim.lsp.config("alloy", {
         cmd = { "alloy", "lsp" },
         filetypes = { "alloy" },
diff --git a/nvim/dot-config/nvim/lua/plugins/treesitter.lua b/nvim/dot-config/nvim/lua/plugins/treesitter.lua
index 3c904f1..10d66c6 100644
--- a/nvim/dot-config/nvim/lua/plugins/treesitter.lua
+++ b/nvim/dot-config/nvim/lua/plugins/treesitter.lua
@@ -8,11 +8,12 @@ return {
       "python", "go", "gomod", "gosum", "gotmpl", "html",
       "lua", "vim", "vimdoc",
       "markdown", "markdown_inline", "yaml",
+      "java",
     })
     vim.api.nvim_create_autocmd("FileType", {
       pattern = {
         "python", "go", "gomod", "gosum", "gotmpl", "html",
-        "lua", "vim", "markdown", "yaml",
+        "lua", "vim", "markdown", "yaml", "java",
       },
       callback = function()
         vim.treesitter.start()
-- 
cgit v1.2.3