enc: java cmd jdtls config

lua/user/lsp/settings/jdtls.lua

@@ -1,5 +1,56 @@
+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
+
+-- 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
+
 return {
-  cmd = { "jdtls" },
+  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,
+  },
   filetypes = { "java" },
   root_dir = require("lspconfig.util").root_pattern(
     -- Single-module projects