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Sample Configurations

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Phạm Võ Quang Minh edited this page May 30, 2024 · 17 revisions

This page contains some sample configurations. You're welcome to add your own or link to your dotfiles.

@hydroakri Configuration

init.lua 
require("lazy").setup({
        {
		"mfussenegger/nvim-jdtls",
		ft = { "java" },
		config = function()
			local project_name = vim.fn.fnamemodify(vim.fn.getcwd(), ":p:h:t")
			local workspace_dir = "/path/to/workspace-root/" .. project_name
			local config = {
				-- The command that starts the language server
				-- See: https://github.com/eclipse/eclipse.jdt.ls#running-from-the-command-line
				cmd = {

					-- 💀
					"/usr/lib/jvm/java-17-openjdk/bin/java", -- or '/path/to/java17_or_newer/bin/java'
					-- depends on if `java` is in your $PATH env variable and if it points to the right version.

					"-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",
					"-Xmx1g",
					"--add-modules=ALL-SYSTEM",
					"--add-opens",
					"java.base/java.util=ALL-UNNAMED",
					"--add-opens",
					"java.base/java.lang=ALL-UNNAMED",

					-- 💀
					"-jar",
					"/home/hydroakri/.local/share/nvim/mason/packages/jdtls/plugins/org.eclipse.equinox.1.6.700.v20231214-2017.jar",
					-- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                       ^^^^^^^^^^^^^^
					-- Must point to the                                                     Change this to
					-- eclipse.jdt.ls installation                                           the actual version

					-- 💀
					"-configuration",
					"/home/hydroakri/.local/share/nvim/mason/packages/jdtls/config_linux",
					-- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^^^^
					-- Must point to the                      Change to one of `linux`, `win` or `mac`
					-- eclipse.jdt.ls installation            Depending on your system.

					-- 💀
					-- See `data directory configuration` section in the README
					"-data",
					workspace_dir,
				},

				-- 💀
				-- This is the default if not provided, you can remove it. Or adjust as needed.
				-- One dedicated LSP server & client will be started per unique root_dir
				root_dir = require("jdtls.setup").find_root({ ".git", "mvnw", "gradlew" }),

				-- Here you can configure eclipse.jdt.ls specific settings
				-- See https://github.com/eclipse/eclipse.jdt.ls/wiki/Running-the-JAVA-LS-server-from-the-command-line#initialize-request
				-- for a list of options
				settings = {
					java = {},
				},

				-- Language server `initializationOptions`
				-- You need to extend the `bundles` with paths to jar files
				-- if you want to use additional eclipse.jdt.ls plugins.
				--
				-- See https://github.com/mfussenegger/nvim-jdtls#java-debug-installation
				--
				-- If you don't plan on using the debugger or other eclipse.jdt.ls plugins you can remove this
				init_options = {
					bundles = {},
				},
			}
			-- This starts a new client & server,
			-- or attaches to an existing client & server depending on the `root_dir`.
			require("jdtls").start_or_attach(config)
		end,
	},
})

@cjgratacos Configuration

java-lsp.sh 
#!/usr/bin/env bash

JAR="$HOME/.local/share/lsp/jdtls-server/plugins/org.eclipse.equinox.launcher_*.jar"

GRADLE_HOME='$HOME/.sdkman/candidates/gradle/current/bin/gradle' java \
  -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=1044 \
  -javaagent:$HOME/.local/jars/lombok.jar \
  -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 \
  -Xms1g \
  -Xmx2G \
  -jar $(echo "$JAR") \
  -configuration "$HOME/.local/share/lsp/jdtls-server/config_linux" \
  -data "$1" \
  --add-modules=ALL-SYSTEM \
  --add-opens java.base/java.util=ALL-UNNAMED \
  --add-opens java.base/java.lang=ALL-UNNAMED
jdtls_setup.lua 
local M = {}

function M.setup()
    local on_attach = function(client, bufnr)
      require'jdtls.setup'.add_commands()
      require'jdtls'.setup_dap()
      require'lsp-status'.register_progress()
      require'compe'.setup {
          enabled = true;
          autocomplete = true;
          debug = false;
          min_length = 1;
          preselect = 'enable';
          throttle_time = 80;
          source_timeout = 200;
          incomplete_delay = 400;
          max_abbr_width = 100;
          max_kind_width = 100;
          max_menu_width = 100;
          documentation = true;

          source = {
            path = true;
            buffer = true;
            calc = true;
            vsnip = false;
            nvim_lsp = true;
            nvim_lua = true;
            spell = true;
            tags = true;
            snippets_nvim = false;
            treesitter = true;
          };
        }

      require'lspkind'.init()
      require'lspsaga'.init_lsp_saga()

      -- Kommentary
      vim.api.nvim_set_keymap("n", "<leader>/", "<plug>kommentary_line_default", {})
      vim.api.nvim_set_keymap("v", "<leader>/", "<plug>kommentary_visual_default", {})

      require'formatter'.setup{
          filetype = {
              java = {
                  function()
                      return {
                          exe = 'java',
                          args = { '-jar', os.getenv('HOME') .. '/.local/jars/google-java-format.jar', vim.api.nvim_buf_get_name(0) },
                          stdin = true
                      }
                  end
              }
          }
      }

      vim.api.nvim_exec([[
        augroup FormatAutogroup
          autocmd!
          autocmd BufWritePost *.java FormatWrite
        augroup end
      ]], true)

      local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
      local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end

      buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

      -- Mappings.
      local opts = { noremap=true, silent=true }
      buf_set_keymap('n', 'gD', '<Cmd>lua vim.lsp.buf.declaration()<CR>', opts)
      buf_set_keymap('n', 'gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', opts)
      buf_set_keymap('n', 'K', '<Cmd>lua vim.lsp.buf.hover()<CR>', opts)
      buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
      buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
      buf_set_keymap('n', '<leader>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
      buf_set_keymap('n', '<leader>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
      buf_set_keymap('n', '<leader>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
      buf_set_keymap('n', '<leader>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
      buf_set_keymap('n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
      buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references() && vim.cmd("copen")<CR>', opts)
      buf_set_keymap('n', '<leader>e', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', opts)
      buf_set_keymap('n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', opts)
      buf_set_keymap('n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', opts)
      buf_set_keymap('n', '<leader>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', opts)
      -- Java specific
      buf_set_keymap("n", "<leader>di", "<Cmd>lua require'jdtls'.organize_imports()<CR>", opts)
      buf_set_keymap("n", "<leader>dt", "<Cmd>lua require'jdtls'.test_class()<CR>", opts)
      buf_set_keymap("n", "<leader>dn", "<Cmd>lua require'jdtls'.test_nearest_method()<CR>", opts)
      buf_set_keymap("v", "<leader>de", "<Esc><Cmd>lua require('jdtls').extract_variable(true)<CR>", opts)
      buf_set_keymap("n", "<leader>de", "<Cmd>lua require('jdtls').extract_variable()<CR>", opts)
      buf_set_keymap("v", "<leader>dm", "<Esc><Cmd>lua require('jdtls').extract_method(true)<CR>", opts)

      buf_set_keymap("n", "<leader>cf", "<cmd>lua vim.lsp.buf.formatting()<CR>", opts)

      vim.api.nvim_exec([[
          hi LspReferenceRead cterm=bold ctermbg=red guibg=LightYellow
          hi LspReferenceText cterm=bold ctermbg=red guibg=LightYellow
          hi LspReferenceWrite cterm=bold ctermbg=red guibg=LightYellow
          augroup lsp_document_highlight
            autocmd!
            autocmd CursorHold <buffer> lua vim.lsp.buf.document_highlight()
            autocmd CursorMoved <buffer> lua vim.lsp.buf.clear_references()
          augroup END
      ]], false)

    end

    local root_markers = {'gradlew', 'pom.xml'}
    local root_dir = require('jdtls.setup').find_root(root_markers)
    local home = os.getenv('HOME')

    local capabilities = {
        workspace = {
            configuration = true
        },
        textDocument = {
            completion = {
                completionItem = {
                    snippetSupport = true
                }
            }
        }
    }

    local workspace_folder = home .. "/.workspace" .. vim.fn.fnamemodify(root_dir, ":p:h:t")
    local config = {
        flags = {
          allow_incremental_sync = true,
        };
        capabilities = capabilities,
        on_attach = on_attach,
    }

    config.settings = {
        ['java.format.settings.url'] = home .. "/.config/nvim/language-servers/java-google-formatter.xml",
        ['java.format.settings.profile'] = "GoogleStyle",
        java = {
          signatureHelp = { enabled = true };
          contentProvider = { preferred = 'fernflower' };
          completion = {
            favoriteStaticMembers = {
              "org.hamcrest.MatcherAssert.assertThat",
              "org.hamcrest.Matchers.*",
              "org.hamcrest.CoreMatchers.*",
              "org.junit.jupiter.api.Assertions.*",
              "java.util.Objects.requireNonNull",
              "java.util.Objects.requireNonNullElse",
              "org.mockito.Mockito.*"
            }
          };
          sources = {
            organizeImports = {
              starThreshold = 9999;
              staticStarThreshold = 9999;
            };
          };
          codeGeneration = {
            toString = {
              template = "${object.className}{${member.name()}=${member.value}, ${otherMembers}}"
            }
          };
          configuration = {
            runtimes = {
              {
                name = "JavaSE-11",
                path = home .. "/.sdkman/candidates/java/11.0.10-open/",
              },
              {
                name = "JavaSE-14",
                path = home .. "/.sdkman/candidates/java/14.0.2-open/",
              },
              {
                name = "JavaSE-15",
                path = home .. "/.sdkman/candidates/java/15.0.1-open/",
              },
            }
          };
        };
    }
    config.cmd = {'java-lsp', workspace_folder}
    config.on_attach = on_attach
    config.on_init = function(client, _)
        client.notify('workspace/didChangeConfiguration', { settings = config.settings })
    end

    -- local jar_patterns = {
    --     '/dev/microsoft/java-debug/com.microsoft.java.debug.plugin/target/com.microsoft.java.debug.plugin-*.jar',
    --     '/dev/dgileadi/vscode-java-decompiler/server/*.jar',
    --     '/dev/microsoft/vscode-java-test/server/*.jar',
    -- }

    -- local bundles = {}
    -- for _, jar_pattern in ipairs(jar_patterns) do
    --   for _, bundle in ipairs(vim.split(vim.fn.glob(home .. jar_pattern), '\n')) do
    --     if not vim.endswith(bundle, 'com.microsoft.java.test.runner.jar') then
    --       table.insert(bundles, bundle)
    --     end
    --   end
    -- end

    local extendedClientCapabilities = require'jdtls'.extendedClientCapabilities
    extendedClientCapabilities.resolveAdditionalTextEditsSupport = true
    config.init_options = {
      -- bundles = bundles;
      extendedClientCapabilities = extendedClientCapabilities;
    }

    -- UI
    local finders = require'telescope.finders'
    local sorters = require'telescope.sorters'
    local actions = require'telescope.actions'
    local pickers = require'telescope.pickers'
    require('jdtls.ui').pick_one_async = function(items, prompt, label_fn, cb)
      local opts = {}
      pickers.new(opts, {
        prompt_title = prompt,
        finder    = finders.new_table {
          results = items,
          entry_maker = function(entry)
            return {
              value = entry,
              display = label_fn(entry),
              ordinal = label_fn(entry),
            }
          end,
        },
        sorter = sorters.get_generic_fuzzy_sorter(),
        attach_mappings = function(prompt_bufnr)
          actions.goto_file_selection_edit:replace(function()
            local selection = actions.get_selected_entry(prompt_bufnr)
            actions.close(prompt_bufnr)

            cb(selection.value)
          end)

          return true
        end,
      }):find()
    end

    -- Server
    require('jdtls').start_or_attach(config)
end

return M
init.vim 
augroup jdtls_lsp
    autocmd!
    autocmd FileType java lua require'jdtls_setup'.setup()
augroup end

@mfussenegger Configuration

Windows Configuration

ftplugin/java.lua 
-- Eclipse Java development tools (JDT) Language Server downloaded from:
-- https://www.eclipse.org/downloads/download.php?file=/jdtls/milestones/1.21.0/jdt-language-server-1.21.0-202303161431.tar.gz
local jdtls = require('jdtls')
-- Change or delete this if you don't depend on nvim-cmp for completions.
local cmp_nvim_lsp = require('cmp_nvim_lsp')

-- Change jdtls_path to wherever you have your Eclipse Java development tools (JDT) Language Server downloaded to.
local jdtls_path = vim.fn.stdpath('data') .. '/language-servers/jdt-language-server'
local launcher_jar = vim.fn.glob(jdtls_path .. '/plugins/org.eclipse.equinox.launcher_*.jar')
local workspace_dir = vim.fn.fnamemodify(vim.fn.getcwd(), ':p:h:t')

vim.o.tabstop = 4
vim.o.shiftwidth = 0

-- for completions
local client_capabilities = vim.lsp.protocol.make_client_capabilities()
local capabilities = cmp_nvim_lsp.default_capabilities(client_capabilities)

local function get_config_dir()
  -- Unlike some other programming languages (e.g. JavaScript)
  -- lua considers 0 truthy!
  if vim.fn.has('linux') == 1 then
    return 'config_linux'
  elseif vim.fn.has('mac') == 1 then
    return 'config_mac'
  else
    return 'config_win'
  end
end

-- See `:help vim.lsp.start_client` for an overview of the supported `config` options.
local config = {
  capabilities = capabilities,
  cmd = {
    -- This sample path was tested on Cygwin, a "unix-like" Windows environment.
    -- Please contribute to this Wiki if this doesn't work for another Windows
    -- environment like [Git for Windows](https://gitforwindows.org/) or PowerShell.
    -- JDTLS currently needs Java 17 to work, but you can replace this line with "java"
    -- if Java 17 is on your PATH.
    "C:/Program Files/Java/jdk-17.0.4.1/bin/java",
    "-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",
    "-Xmx1G",
    "--add-modules=ALL-SYSTEM",
    "--add-opens", "java.base/java.util=ALL-UNNAMED",
    "--add-opens", "java.base/java.lang=ALL-UNNAMED",
    "-jar", launcher_jar,
    "-configuration", vim.fs.normalize(jdtls_path .. '/' .. get_config_dir()),
    "-data", vim.fn.expand('~/.cache/jdtls-workspace/') .. workspace_dir
  },
  settings = {
    ['java.format.settings.url'] = vim.fn.expand("~/formatter.xml")
  },
  root_dir = vim.fs.dirname(vim.fs.find({ 'pom.xml', '.git' }, { upward = true })[1]),
  init_options = {
    -- https://github.com/eclipse/eclipse.jdt.ls/wiki/Language-Server-Settings-&-Capabilities#extended-client-capabilities
    extendedClientCapabilities = jdtls.extendedClientCapabilities,
  },
  on_attach = function(client, bufnr)
    -- https://github.com/mfussenegger/dotfiles/blob/833d634251ebf3bf7e9899ed06ac710735d392da/vim/.config/nvim/ftplugin/java.lua#L88-L94
    local opts = { silent = true, buffer = bufnr }
    vim.keymap.set('n', "<leader>lo", jdtls.organize_imports, { desc = 'Organize imports', buffer = bufnr })
    -- Should 'd' be reserved for debug?
    vim.keymap.set('n', "<leader>df", jdtls.test_class, opts)
    vim.keymap.set('n', "<leader>dn", jdtls.test_nearest_method, opts)
    vim.keymap.set('n', '<leader>rv', jdtls.extract_variable_all, { desc = 'Extract variable', buffer = bufnr })
    vim.keymap.set('v', '<leader>rm', [[<ESC><CMD>lua require('jdtls').extract_method(true)<CR>]],
      { desc = 'Extract method', buffer = bufnr })
    vim.keymap.set('n', '<leader>rc', jdtls.extract_constant, { desc = 'Extract constant', buffer = bufnr })
  end
}

jdtls.start_or_attach(config)

@pavva91 Configuration

I'm coming from kickstart so I'm using:

I keep the 💀 for parts that you eventually need to change

lua/jdtls/jdtls_setup.lua 
local M = {}

function M.setup()
  local jdtls = require("jdtls")
  local jdtls_dap = require("jdtls.dap")
  local jdtls_setup = require("jdtls.setup")
  local home = os.getenv("HOME")

  local root_markers = { ".git", "mvnw", "gradlew", "pom.xml", "build.gradle" }
  local root_dir = jdtls_setup.find_root(root_markers)

  local project_name = vim.fn.fnamemodify(root_dir, ":p:h:t")
  local workspace_dir = home .. "/.cache/jdtls/workspace" .. project_name

    -- 💀
  local path_to_mason_packages = home .. "/.local/share/nvim/mason/packages"
    -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                       ^^^^^^^^^^^^^^

  local path_to_jdtls = path_to_mason_packages .. "/jdtls"
  local path_to_jdebug = path_to_mason_packages .. "/java-debug-adapter"
  local path_to_jtest = path_to_mason_packages .. "/java-test"

  local path_to_config = path_to_jdtls .. "/config_linux"
  local lombok_path = path_to_jdtls .. "/lombok.jar"

    -- 💀
  local path_to_jar = path_to_jdtls .. "/plugins/org.eclipse.equinox.launcher_1.6.500.v20230717-2134.jar"
    -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                       ^^^^^^^^^^^^^^

  local bundles = {
    vim.fn.glob(path_to_jdebug .. "/extension/server/com.microsoft.java.debug.plugin-*.jar", true),
  }

  vim.list_extend(bundles, vim.split(vim.fn.glob(path_to_jtest .. "/extension/server/*.jar", true), "\n"))

  -- LSP settings for Java.
  local on_attach = function(_, bufnr)
    jdtls.setup_dap({ hotcodereplace = "auto" })
    jdtls_dap.setup_dap_main_class_configs()
    jdtls_setup.add_commands()

    -- Create a command `:Format` local to the LSP buffer
    vim.api.nvim_buf_create_user_command(bufnr, "Format", function(_)
      vim.lsp.buf.format()
    end, { desc = "Format current buffer with LSP" })

    require("lsp_signature").on_attach({
      bind = true,
      padding = "",
      handler_opts = {
        border = "rounded",
      },
      hint_prefix = "󱄑 ",
    }, bufnr)

    -- NOTE: comment out if you don't use Lspsaga
    require 'lspsaga'.init_lsp_saga()

  end

  local capabilities = {
    workspace = {
      configuration = true
    },
    textDocument = {
      completion = {
        completionItem = {
          snippetSupport = true
        }
      }
    }
  }

  local config = {
    flags = {
      allow_incremental_sync = true,
    }
  }

  config.cmd = {
    --
    -- 				-- 💀
    "java", -- or '/path/to/java17_or_newer/bin/java'
    -- depends on if `java` is in your $PATH env variable and if it points to the right version.

    "-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",
    "-Xmx1g",
    "-javaagent:" .. lombok_path,
    "--add-modules=ALL-SYSTEM",
    "--add-opens",
    "java.base/java.util=ALL-UNNAMED",
    "--add-opens",
    "java.base/java.lang=ALL-UNNAMED",

    -- 💀
    "-jar",
    path_to_jar,
    -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                       ^^^^^^^^^^^^^^
    -- Must point to the                                                     Change this to
    -- eclipse.jdt.ls installation                                           the actual version

    -- 💀
    "-configuration",
    path_to_config,
    -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        ^^^^^^
    -- Must point to the                      Change to one of `linux`, `win` or `mac`
    -- eclipse.jdt.ls installation            Depending on your system.

    -- 💀
    -- See `data directory configuration` section in the README
    "-data",
    workspace_dir,
  }

  config.settings = {
    java = {
      references = {
        includeDecompiledSources = true,
      },
      format = {
        enabled = true,
        settings = {
          url = vim.fn.stdpath("config") .. "/lang_servers/intellij-java-google-style.xml",
          profile = "GoogleStyle",
        },
      },
      eclipse = {
        downloadSources = true,
      },
      maven = {
        downloadSources = true,
      },
      signatureHelp = { enabled = true },
      contentProvider = { preferred = "fernflower" },
      -- eclipse = {
      -- 	downloadSources = true,
      -- },
      -- implementationsCodeLens = {
      -- 	enabled = true,
      -- },
      completion = {
        favoriteStaticMembers = {
          "org.hamcrest.MatcherAssert.assertThat",
          "org.hamcrest.Matchers.*",
          "org.hamcrest.CoreMatchers.*",
          "org.junit.jupiter.api.Assertions.*",
          "java.util.Objects.requireNonNull",
          "java.util.Objects.requireNonNullElse",
          "org.mockito.Mockito.*",
        },
        filteredTypes = {
          "com.sun.*",
          "io.micrometer.shaded.*",
          "java.awt.*",
          "jdk.*",
          "sun.*",
        },
        importOrder = {
          "java",
          "javax",
          "com",
          "org",
        },
      },
      sources = {
        organizeImports = {
          starThreshold = 9999,
          staticStarThreshold = 9999,
        },
      },
      codeGeneration = {
        toString = {
          template = "${object.className}{${member.name()}=${member.value}, ${otherMembers}}",
          -- flags = {
          -- 	allow_incremental_sync = true,
          -- },
        },
        useBlocks = true,
      },
      -- configuration = {
      --     runtimes = {
      --         {
      --             name = "java-17-openjdk",
      --             path = "/usr/lib/jvm/default-runtime/bin/java"
      --         }
      --     }
      -- }
      -- project = {
      -- 	referencedLibraries = {
      -- 		"**/lib/*.jar",
      -- 	},
      -- },
    },
  }

  config.on_attach = on_attach
  config.capabilities = capabilities
  config.on_init = function(client, _)
    client.notify('workspace/didChangeConfiguration', { settings = config.settings })
  end

  local extendedClientCapabilities = require 'jdtls'.extendedClientCapabilities
  extendedClientCapabilities.resolveAdditionalTextEditsSupport = true

  config.init_options = {
    bundles = bundles,
    extendedClientCapabilities = extendedClientCapabilities,
  }

  -- Start Server
  require('jdtls').start_or_attach(config)

  -- Set Java Specific Keymaps
  require("jdtls.keymaps")
end

return M
lua/jdtls/keymaps.lua 
-- NOTE: Java specific keymaps with which key
vim.cmd(
  "command! -buffer -nargs=? -complete=custom,v:lua.require'jdtls'._complete_compile JdtCompile lua require('jdtls').compile(<f-args>)"
)
vim.cmd(
  "command! -buffer -nargs=? -complete=custom,v:lua.require'jdtls'._complete_set_runtime JdtSetRuntime lua require('jdtls').set_runtime(<f-args>)"
)
vim.cmd("command! -buffer JdtUpdateConfig lua require('jdtls').update_project_config()")
vim.cmd("command! -buffer JdtJol lua require('jdtls').jol()")
vim.cmd("command! -buffer JdtBytecode lua require('jdtls').javap()")
vim.cmd("command! -buffer JdtJshell lua require('jdtls').jshell()")

local status_ok, which_key = pcall(require, "which-key")
if not status_ok then
  return
end

local opts = {
  mode = "n",     -- NORMAL mode
  prefix = "<leader>",
  buffer = nil,   -- Global mappings. Specify a buffer number for buffer local mappings
  silent = true,  -- use `silent` when creating keymaps
  noremap = true, -- use `noremap` when creating keymaps
  nowait = true,  -- use `nowait` when creating keymaps
}

local vopts = {
  mode = "v",     -- VISUAL mode
  prefix = "<leader>",
  buffer = nil,   -- Global mappings. Specify a buffer number for buffer local mappings
  silent = true,  -- use `silent` when creating keymaps
  noremap = true, -- use `noremap` when creating keymaps
  nowait = true,  -- use `nowait` when creating keymaps
}

local mappings = {
  J = {
    name = "Java",
    o = { "<Cmd>lua require'jdtls'.organize_imports()<CR>", "Organize Imports" },
    v = { "<Cmd>lua require('jdtls').extract_variable()<CR>", "Extract Variable" },
    c = { "<Cmd>lua require('jdtls').extract_constant()<CR>", "Extract Constant" },
    t = { "<Cmd>lua require'jdtls'.test_nearest_method()<CR>", "Test Method" },
    T = { "<Cmd>lua require'jdtls'.test_class()<CR>", "Test Class" },
    u = { "<Cmd>JdtUpdateConfig<CR>", "Update Config" },
  },
}

local vmappings = {
  J = {
    name = "Java",
    v = { "<Esc><Cmd>lua require('jdtls').extract_variable(true)<CR>", "Extract Variable" },
    c = { "<Esc><Cmd>lua require('jdtls').extract_constant(true)<CR>", "Extract Constant" },
    m = { "<Esc><Cmd>lua require('jdtls').extract_method(true)<CR>", "Extract Method" },
  },
}

which_key.register(mappings, opts)
which_key.register(vmappings, vopts)

-- If you want you can add here Old School Mappings. Me I setup Telescope, LSP and Lspsaga mapping somewhere else and I just reuse them

-- vim.keymap.set("gI", vim.lsp.buf.implementation,{ desc = "[G]oto [I]mplementation" })
-- vim.keymap.set("<leader>D", vim.lsp.buf.type_definition,{ desc = "Type [D]efinition" })
-- vim.keymap.set("<leader>hh", vim.lsp.buf.signature_help,{ desc = "Signature [H][H]elp Documentation" })

-- vim.keymap.set("gD", vim.lsp.buf.declaration,{ desc = "[G]oto [D]eclaration" })
-- vim.keymap.set("<leader>wa", vim.lsp.buf.add_workspace_folder,{ desc = "[W]orkspace [A]dd Folder" })
-- vim.keymap.set("<leader>wr", vim.lsp.buf.remove_workspace_folder,{ desc = "[W]orkspace [R]emove Folder" })
-- vim.keymap.set("<leader>wl", function()
--   print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
-- end, "[W]orkspace [L]ist Folders")

-- Create a command `:Format` local to the LSP buffer
-- vim.api.nvim_buf_create_user_command(bufnr, "Format", function(_)
--   vim.lsp.buf.format()
-- end, { desc = "Format current buffer with LSP" })

-- vim.keymap.set("n", "gr", vim.lsp.buf.references, { desc = "[G]oto [R]eferences - Java", expr = true, silent = true })
-- vim.keymap.set("n","gr", require("telescope.builtin").lsp_references,{ desc = "[G]oto [R]eferences" })
-- vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, { desc = "" })
-- vim.keymap.set('n', 'gd', vim.lsp.buf.definition, { desc = "" })
-- vim.keymap.set('n', 'K', vim.lsp.buf.hover, { desc = "" })
-- vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, { desc = "" })
-- vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, { desc = "" })
-- vim.keymap.set('n', '<leader>wa', vim.lsp.buf.add_workspace_folder, { desc = "" })
-- vim.keymap.set('n', '<leader>wr', vim.lsp.buf.remove_workspace_folder, { desc = "" })
-- vim.keymap.set('n', '<leader>wl', print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', { desc = "" })
-- vim.keymap.set('n', '<leader>D', vim.lsp.buf.type_definition, { desc = "" })
-- vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, { desc = "" })
-- vim.keymap.set('n', 'gr', vim.lsp.buf.references() && vim.cmd("copen")<CR>', { desc = "" })
-- vim.keymap.set('n', '<leader>e', vim.lsp.diagnostic.show_line_diagnostics, { desc = "" })
-- vim.keymap.set('n', '[d', vim.lsp.diagnostic.goto_prev, { desc = "" })
-- vim.keymap.set('n', ']d', vim.lsp.diagnostic.goto_next, { desc = "" })
-- vim.keymap.set('n', '<leader>q', vim.lsp.diagnostic.set_loclist, { desc = "" })

-- -- Java specific
-- vim.keymap.set("n", "<leader>di", "<Cmd>lua require'jdtls'.organize_imports()<CR>", { desc = "" })
-- vim.keymap.set("n", "<leader>dt", "<Cmd>lua require'jdtls'.test_class()<CR>", { desc = "" })
-- vim.keymap.set("n", "<leader>dn", "<Cmd>lua require'jdtls'.test_nearest_method()<CR>", { desc = "" })
-- vim.keymap.set("v", "<leader>de", "<Esc><Cmd>lua require('jdtls').extract_variable(true)<CR>", { desc = "" })
-- vim.keymap.set("n", "<leader>de", "<Cmd>lua require('jdtls').extract_variable()<CR>", { desc = "" })
-- vim.keymap.set("v", "<leader>dm", "<Esc><Cmd>lua require('jdtls').extract_method(true)<CR>", { desc = "" })
--
-- vim.keymap.set("n", "<leader>cf", "<cmd>lua vim.lsp.buf.formatting()<CR>", { desc = "" })
init.lua
  1. Import plugin with Lazy:
require("lazy").setup({
    {
        "mfussenegger/nvim-jdtls",
    },
}, {})
  1. Create autocmd to run on every buffer with filetype java
vim.cmd [[
augroup jdtls_lsp
    autocmd!
    autocmd FileType java lua require'jdtls.jdtls_setup'.setup()
augroup end
]]

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