feat(java): add treesit support

modules/lang/java/config.el

@@ -30,13 +30,18 @@ If the depth is 2, the first two directories are removed: net.lissner.game.")
            (modulep! :tools lsp -eglot))
   (load! "+lsp"))
 
-(when (modulep! +tree-sitter)
-  (add-hook 'java-mode-local-vars-hook #'tree-sitter! 'append))
-
 
 ;;
 ;;; Common packages
 
+(use-package! java-ts-mode
+  :when (modulep! +tree-sitter)
+  :when (fboundp 'java-ts-mode) ; 29.1+ only
+  :defer t
+  :init
+  (set-tree-sitter! 'java-mode 'java-ts-mode '(java doxygen)))
+
+
 (use-package! android-mode
   :commands android-mode
   :init

modules/lang/java/doctor.el

@@ -9,6 +9,10 @@
              (modulep! :tools tree-sitter))
          "This module requires (:tools tree-sitter)")
 
+(assert! (or (not (modulep! +tree-sitter))
+             (fboundp 'java-ts-mode))
+         "Can't find `java-ts-mode'; Emacs 29.1+ is required")
+
 (unless (executable-find "javac")
   (warn! "Couldn't find the javac executable, are you sure the JDK is installed?"))