jumper.nvim

Support for Jumper in Neovim: scripts (.jmp), configs (.jmc) and access policies (.jma).

Highlighting, diagnostics, hover, completion, go to definition (into Java too), references, rename and more - through the Jumper language server.

Requires Neovim 0.9+, Java 21+ and curl.

Install (lazy.nvim / LazyVim)

{ "jumper-lang/jumper.nvim", lazy = false, opts = {} }

The first Jumper file you open downloads the language server (jmp.jar) from jumper Releases, checks its SHA-256 and keeps it in Neovim's data folder. :JumperInstall downloads it again.

Install without a plugin manager

git clone https://github.com/jumper-lang/jumper.nvim ~/.local/share/nvim/site/pack/jumper/start/jumper.nvim

On Windows the folder is %LOCALAPPDATA%\nvim-data\site\pack\jumper\start\jumper.nvim. Then in init.lua:

require("jumper").setup()

Use a jmp.jar from GitHub Releases

To run a server you downloaded yourself (from jumper Releases), point the plugin at it:

{ "jumper-lang/jumper.nvim", lazy = false, opts = { jar = "C:/tools/jmp.jar" } }

Options

Option	Default	What
java	JAVA_HOME, then java	The java to run the server with
jar	downloaded release	Your own jmp.jar
jvm_args	{}	Extra JVM arguments, e.g. { "-Xmx512m" }