diff --git a/ftplugin_backup/java.lua b/ftplugin_backup/java.lua
new file mode 100644
index 0000000..5160768
--- /dev/null
+++ b/ftplugin_backup/java.lua
@@ -0,0 +1,134 @@
+-- more space in the neovim command line for displaying messages
+-- use this function notation to build some variables
+vim.opt_local.shiftwidth = 4
+vim.opt_local.tabstop = 4
+vim.opt_local.softtabstop = 4
+vim.opt_local.ts = 4
+vim.opt_local.expandtab = true
+
+local status, jdtls = pcall(require, "jdtls")
+if not status then
+	return
+end
+
+local function capabilities()
+	local status_ok, cmp_nvim_lsp = pcall(require, "cmp_nvim_lsp")
+	if status_ok then
+		return cmp_nvim_lsp.default_capabilities()
+	end
+
+	local capabilities = vim.lsp.protocol.make_client_capabilities()
+	capabilities.textDocument.completion.completionItem.snippetSupport = true
+	capabilities.textDocument.completion.completionItem.resolveSupport = {
+		properties = {
+			"documentation",
+			"detail",
+			"additionalTextEdits",
+		},
+	}
+
+	return capabilities
+end
+
+local function directory_exists(path)
+	local f = io.popen("cd " .. path)
+	local ff = f:read("*all")
+
+	if ff:find("ItemNotFoundException") then
+		return false
+	else
+		return true
+	end
+end
+
+local root_markers = { ".git", "mvnw", "gradlew", "pom.xml", "build.gradle" }
+local root_dir = require("jdtls.setup").find_root(root_markers)
+
+-- calculate workspace dir
+local project_name = vim.fn.fnamemodify(vim.fn.getcwd(), ":p:h:t")
+local workspace_dir = vim.fn.stdpath("data") .. "/site/java/workspace-root/" .. project_name
+if directory_exists(workspace_dir) then
+else
+	os.execute("mkdir " .. workspace_dir)
+end
+-- get the mason install path
+local install_path = require("mason-registry").get_package("jdtls"):get_install_path()
+
+-- get the current OS
+local os
+if vim.fn.has("macunix") then
+	os = "mac"
+elseif vim.fn.has("win32") then
+	os = "win"
+else
+	os = "linux"
+end
+
+local bundles = {}
+local mason_path = vim.fn.glob(vim.fn.stdpath("data") .. "/mason/")
+vim.list_extend(bundles, vim.split(vim.fn.glob(mason_path .. "packages/java-test/extension/server/*.jar"), "\n"))
+vim.list_extend(
+	bundles,
+	vim.split(
+		vim.fn.glob(mason_path .. "packages/java-debug-adapter/extension/server/com.microsoft.java.debug.plugin-*.jar"),
+		"\n"
+	)
+)
+
+local config = {
+	cmd = {
+		"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",
+		"-javaagent:" .. install_path .. "/lombok.jar",
+		"-Xms1g",
+		"--add-modules=ALL-SYSTEM",
+		"--add-opens",
+		"java.base/java.util=ALL-UNNAMED",
+		"--add-opens",
+		"java.base/java.lang=ALL-UNNAMED",
+		"-jar",
+		vim.fn.glob(install_path .. "/plugins/org.eclipse.equinox.launcher_*.jar"),
+		"-configuration",
+		install_path .. "/config_" .. os,
+		"-data",
+		workspace_dir,
+	},
+	capabilities = capabilities(),
+	root_dir = root_dir,
+	settings = {
+		java = {},
+	},
+
+	init_options = {
+		bundles = {
+			vim.fn.glob(
+				mason_path .. "packages/java-debug-adapter/extension/server/com.microsoft.java.debug.plugin-*.jar",
+				"\n"
+			),
+		},
+	},
+}
+
+config["on_attach"] = function(client, bufnr)
+	local _, _ = pcall(vim.lsp.codelens.refresh)
+	require("jdtls.dap").setup_dap_main_class_configs()
+	jdtls.setup_dap({ hotcodereplace = "auto" })
+	require("user.lsp.handlers").on_attach(client, bufnr)
+end
+
+vim.api.nvim_create_autocmd({ "BufWritePost" }, {
+	pattern = { "*.java" },
+	callback = function()
+		local _, _ = pcall(vim.lsp.codelens.refresh)
+	end,
+})
+
+jdtls.start_or_attach(config)
+
+vim.cmd(
+	[[command! -buffer -nargs=? -complete=custom,v:lua.require'jdtls'._complete_set_runtime JdtSetRuntime lua require('jdtls').set_runtime(<f-args>)]]
+)