feat: add config JDTLS

Author: Jirapat Chookleeb

init.lua

@@ -683,7 +683,7 @@ require('lazy').setup({
         -- But for many setups, the LSP (`ts_ls`) will work just fine
         -- ts_ls = {},
         --
-
+        jdtls = {},
         lua_ls = {
           -- cmd = { ... },
           -- filetypes = { ... },
@@ -722,6 +722,11 @@ require('lazy').setup({
       require('mason-lspconfig').setup {
         ensure_installed = {}, -- explicitly set to an empty table (Kickstart populates installs via mason-tool-installer)
         automatic_installation = false,
+        automatic_enable = {
+          exclude = {
+            'jdtls',
+          },
+        },
         handlers = {
           function(server_name)
             local server = servers[server_name] or {}
@@ -777,6 +782,10 @@ require('lazy').setup({
     },
   },
 
+  {
+    'mfussenegger/nvim-jdtls',
+  },
+
   { -- Autocompletion
     'saghen/blink.cmp',
     event = 'VimEnter',
@@ -1012,5 +1021,13 @@ require('lazy').setup({
   },
 })
 
--- The line beneath this is called `modeline`. See `:help modeline`
+vim.api.nvim_create_autocmd('FileType', {
+  pattern = 'java',
+  callback = function()
+    vim.opt_local.tabstop = 2
+    vim.opt_local.shiftwidth = 2
+
+    require('lsp.jdtls').setup()
+  end,
+}) -- The line beneath this is called `modeline`. See `:help modeline`
 -- vim: ts=2 sts=2 sw=2 et

lua/lsp/jdtls.lua

@@ -0,0 +1,98 @@
+local M = {}
+
+function M.setup()
+  local home = os.getenv 'HOME'
+  local workspace_path = home .. '/.local/share/nvim/jdtls-workspace/'
+  local project_name = vim.fn.fnamemodify(vim.fn.getcwd(), ':p:h:t')
+  local workspace_dir = workspace_path .. project_name
+
+  local status, jdtls = pcall(require, 'jdtls')
+  if not status then
+    vim.notify('jdtls not found!', vim.log.levels.ERROR)
+    return
+  end
+
+  local extendedClientCapabilities = jdtls.extendedClientCapabilities
+
+  -- Root markers for Java project
+  local root_markers = { '.git', 'mvnw', 'gradlew', 'pom.xml', 'build.gradle' }
+
+  local function find_root_dir()
+    local parent_dir = vim.fn.fnamemodify(vim.fn.getcwd(), ':h')
+    local root = jdtls.setup.find_root(root_markers, parent_dir)
+    if not root or root == '' then
+      root = jdtls.setup.find_root(root_markers)
+    end
+    return root or vim.fn.getcwd()
+  end
+
+  -- Java executable (Java 25, macOS)
+  local java_exe = '/Library/Java/JavaVirtualMachines/temurin-25.jdk/Contents/Home/bin/java'
+
+  local config = {
+    cmd = {
+      java_exe,
+      '-Declipse.application=org.eclipse.jdt.ls.core.id1',
+      '-Dosgi.bundles.defaultStartLevel=4',
+      '-Declipse.product=org.eclipse.jdt.ls.core.product',
+      '-Dlog.protocol=true',
+      '-Dlog.level=ALL',
+      '-Xmx2g',
+      '--add-modules=ALL-SYSTEM',
+      '--add-opens',
+      'java.base/java.util=ALL-UNNAMED',
+      '--add-opens',
+      'java.base/java.lang=ALL-UNNAMED',
+      '-javaagent:' .. home .. '/.local/share/nvim/mason/packages/jdtls/lombok.jar',
+      '-jar',
+      vim.fn.glob(home .. '/.local/share/nvim/mason/packages/jdtls/plugins/org.eclipse.equinox.launcher_*.jar'),
+      '-configuration',
+      home .. '/.local/share/nvim/mason/packages/jdtls/config_mac',
+      '-data',
+      workspace_dir,
+    },
+
+    root_dir = find_root_dir(),
+
+    settings = {
+      java = {
+        signatureHelp = { enabled = true },
+        extendedClientCapabilities = extendedClientCapabilities,
+        maven = { downloadSources = true },
+        referencesCodeLens = { enabled = true },
+        references = { includeDecompiledSources = true },
+        inlayHints = { parameterNames = { enabled = 'all' } },
+        format = { enabled = false },
+        saveActions = { organizeImports = false },
+      },
+    },
+
+    init_options = {
+      bundles = {},
+    },
+  }
+
+  -- Start or attach jdtls
+  jdtls.start_or_attach(config)
+
+  --------------------------------------------------------------------
+  -- Keymaps
+  --------------------------------------------------------------------
+  local opts = { noremap = true, silent = true }
+
+  vim.keymap.set('n', '<leader>jo', "<Cmd>lua require'jdtls'.organize_imports()<CR>", { desc = 'Organize Imports' })
+  vim.keymap.set('n', '<leader>jrv', "<Cmd>lua require('jdtls').extract_variable()<CR>", { desc = 'Extract Variable' })
+  vim.keymap.set('v', '<leader>jrv', "<Esc><Cmd>lua require('jdtls').extract_variable(true)<CR>", { desc = 'Extract Variable' })
+  vim.keymap.set('n', '<leader>jrc', "<Cmd>lua require('jdtls').extract_constant()<CR>", { desc = 'Extract Constant' })
+  vim.keymap.set('v', '<leader>jrc', "<Esc><Cmd>lua require('jdtls').extract_constant(true)<CR>", { desc = 'Extract Constant' })
+  vim.keymap.set('v', '<leader>jrm', "<Esc><Cmd>lua require('jdtls').extract_method(true)<CR>", { desc = 'Extract Method' })
+  vim.keymap.set('n', 'nd', vim.lsp.buf.definition, { desc = 'Go to Definition' })
+  vim.keymap.set('n', 'nD', vim.lsp.buf.declaration, { desc = 'Go to Declaration' })
+  vim.keymap.set('n', 'nr', vim.lsp.buf.references, { desc = 'References' })
+  vim.keymap.set('n', 'ni', vim.lsp.buf.implementation, { desc = 'Go to Implementation' })
+  vim.keymap.set('n', 'K', vim.lsp.buf.hover, { desc = 'Hover Documentation' })
+  vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, { desc = 'Rename Symbol' })
+  vim.keymap.set('n', '<leader>ca', vim.lsp.buf.code_action, { desc = 'Code Action' })
+end
+
+return M