fix: add jdk package

Author: augustomelo

java/flake.nix

@@ -22,7 +22,7 @@
 
       devShells = forEachSupportedSystem ({ pkgs }: {
         default = pkgs.mkShell {
-          packages = with pkgs; [ maven gradle gcc ncurses patchelf zlib ];
+          packages = with pkgs; [ jdk maven gradle gcc ncurses patchelf zlib ];
         };
       });
     };