updated formatter and java home for config config

after/plugin/java-config.lua

@@ -1,2 +1,18 @@
+local java_21_home_dir = '/Library/Java/JavaVirtualMachines/openjdk.jdk/Contents/Home/bin/java'
+
 require('java').setup()
-require('lspconfig').jdtls.setup {}
+require('lspconfig').jdtls.setup {
+  settings = {
+    java = {
+      configuration = {
+        runtimes = {
+          {
+            name = 'JavaSE-21',
+            path = java_21_home_dir .. '/bin/java',
+            default = true,
+          },
+        },
+      },
+    },
+  },
+}