diff --git a/.gitignore b/.gitignore
index 15fdd9a..b1409d6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,4 +19,7 @@ yarn-error.log
 .shadow-cljs
 .nrepl-port
 nohup.out
-lib/**/*.elc
\ No newline at end of file
+lib/**/*.elc
+*.elc
+tmp/
+test-runner/
\ No newline at end of file
diff --git a/config/fg42.user.el b/config/fg42.user.el
index ad327ff..075d6f8 100644
--- a/config/fg42.user.el
+++ b/config/fg42.user.el
@@ -14,7 +14,7 @@
 ;; =========
 ;; Disable abilities which you don't want.
 (disable 'rbenv 'helm 'spell 'linum 'tabbar
-         'smart-mode-line 'desktop-mode 'lsp
+         'smart-mode-line 'desktop-mode
          'dired+ 'guru 'emoji 'elpy 'github
          'versioned-backup)
 
@@ -34,6 +34,7 @@
                      'common-lisp
                      'python
                      'arduino
+                     'java
                      'racket
                      'irc
                      'latex)
diff --git a/lib/extensions/development.el b/lib/extensions/development.el
index 8b64fe6..d0560c0 100644
--- a/lib/extensions/development.el
+++ b/lib/extensions/development.el
@@ -68,6 +68,9 @@
               (depends-on 'lsp-ui)
               (depends-on 'company-lsp))
 
+(with-ability dap
+              (depends-on 'dap-mode))
+
 ;; TODO: Add flycheck-color-modebar
 ;; TODO  Add flycheck-tip
 
diff --git a/lib/extensions/development/init.el b/lib/extensions/development/init.el
index 5bc8cc2..bce090e 100644
--- a/lib/extensions/development/init.el
+++ b/lib/extensions/development/init.el
@@ -66,6 +66,9 @@
            (setq lsp-prefer-flymake nil)
            (add-hook 'lsp-mode-hook 'lsp-ui-mode))
 
+  (ability dap ('lsp)
+           (dap-mode 1)
+           (dap-ui-mode 1))
 
   (ability bookmarks ()
            (setq bm-restore-repository-on-load t)
diff --git a/lib/extensions/java.el b/lib/extensions/java.el
new file mode 100644
index 0000000..fd27e9a
--- /dev/null
+++ b/lib/extensions/java.el
@@ -0,0 +1,27 @@
+;;; JavaExtension --- Enables java development on FG42
+;;; Commentary:
+;;; Code:
+
+(require 'fpkg)
+(require 'fg42/extension)
+(require 'extensions/java/init)
+
+;; Dependencies ----------------------------------
+
+(depends-on 'gradle-mode)
+
+(with-ability lsp-java
+              (depends-on 'lsp-java))
+
+
+(defun java-doc ()
+  "TBD")
+
+;; Extension -------------------------------------
+(extension java
+           :version "2.32"
+           :on-initialize extensions/java-initialize
+           :docs "lib/extensions/java/readme.org")
+
+(provide 'extensions/java)
+;;; java.el ends here
diff --git a/lib/extensions/java/init.el b/lib/extensions/java/init.el
new file mode 100644
index 0000000..52a401c
--- /dev/null
+++ b/lib/extensions/java/init.el
@@ -0,0 +1,21 @@
+;;; java-init --- The entry point for common lisp extension
+;;; Commentary:
+;;; Code:
+
+;;;###autoload
+(defun extensions/java-initialize ()
+  "Initialize the common Lisp extension."
+
+  (require 'gradle-mode)
+  (add-hook 'java-mode-hook
+            '(lambda()
+               (ability lsp-java ('lsp)
+                        (setq lsp-java-server-install-dir fg42-tmp)
+                        (lsp))
+               (ability dap-java ('dap)
+                        (require 'dap-java))
+               (gradle-mode 1))))
+
+
+(provide 'extensions/java/init)
+;;; init ends here
diff --git a/lib/fg42.el b/lib/fg42.el
index 0024d06..ad6ecc8 100644
--- a/lib/fg42.el
+++ b/lib/fg42.el
@@ -27,6 +27,8 @@
 (defvar fg42-home (getenv "FG42_HOME")
   "The pass to fg42-home.")
 
+(defvar fg42-tmp (concat fg42-home "/tmp"))
+
 (defvar fg42-before-initialize-hook nil
   "This hook will be called before FG42 initilization process.")
 
@@ -43,6 +45,7 @@
 (defun fg42-initialize ()
   "Initialize FG42 editor."
   (run-hooks 'fg42-before-initialize-hook)
+  (mkdir fg42-tmp t)
   (setq package-user-dir (concat fg42-home "/packages"))
   (fpkg-initialize)
   (initialize-extensions)