Add java extra and configure jdtls

lua/plugins/java.lua

@@ -0,0 +1,33 @@
+return {
+  {
+    "mfussenegger/nvim-jdtls",
+    opts = function(_, opts)
+      local corretto8 = "/Library/Java/JavaVirtualMachines/amazon-corretto-8.jdk/Contents/Home"
+      local temurin21 = "/Library/Java/JavaVirtualMachines/temurin-21.jdk/Contents/Home"
+
+      opts.cmd = opts.cmd or {}
+      table.insert(opts.cmd, "--java-executable")
+      table.insert(opts.cmd, temurin21 .. "/bin/java")
+
+      local project_jdk = vim.env.JAVA_HOME or temurin21
+
+      opts.settings = vim.tbl_deep_extend("force", opts.settings or {}, {
+        java = {
+          import = {
+            gradle = {
+              java = { home = project_jdk },
+            },
+          },
+          configuration = {
+            runtimes = {
+              { name = "JavaSE-1.8", path = corretto8 },
+              { name = "JavaSE-21", path = temurin21 },
+            },
+          },
+        },
+      })
+
+      return opts
+    end,
+  },
+}