gnu: Add emacs-lsp-java.

* gnu/packages/emacs-xyz.scm (emacs-lsp-java): New variable.

gnu/packages/emacs-xyz.scm

@@ -17848,6 +17848,33 @@ processes for Emacs")
              (lambda _
                (copy-recursively "../extra" ".")))))))))
 
+(define-public emacs-lsp-java
+  (package
+    (name "emacs-lsp-java")
+    (version "2.2")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/emacs-lsp/lsp-java.git")
+                    (commit version)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0hcnvbyaqyypgby1bfj4zbrbq97amk8hfx0sj4w73rl46yf4jk3j"))))
+    (build-system emacs-build-system)
+    (propagated-inputs
+      `(("emacs-lsp-mode" ,emacs-lsp-mode)
+        ("emacs-markdown-mode" ,emacs-markdown-mode)
+        ("emacs-dash" ,emacs-dash)
+        ("emacs-f" ,emacs-f)
+        ("emacs-ht" ,emacs-ht)
+        ("emacs-request" ,emacs-request)
+        ("emacs-treemacs" ,emacs-treemacs)))
+    (home-page "https://github.com/emacs-lsp/lsp-java/")
+    (synopsis "Java support for lsp-mode")
+    (description "Emacs Java IDE using Eclipse JDT Language Server.")
+    (license license:gpl3+)))
+
 (define-public emacs-lsp-ui
   (package
     (name "emacs-lsp-ui")