Javacomplete2 to jc.nvim

With the advent of LSP, it’s time to finish the development of my plugin for development on Java in Vim. Goodbye vim-javacomplete2, it was fun to be with you.

But, since I wanted to save my workflow when working with Java applications, I decided to transfer the functionality from vim-jc2 to the new jc.nvim plugin.

And so, meet jc.nvim – neovim plugin for working with Java, with LSP support.

Old functionality

It is clear that the main task of the plugin is the autocompleting of the code when writing it. Now this function works even better, since the Eclipse server operates under the hood. jc.nvim takes care of starting the server with the desired parameters.

To preserve the muscle memory of my fingers, I transfered some functionality from the old plugin. Such as:

Additional functionality

Automatic installation of external utilities

When activating, the plugin will check the presence of the necessary and optional utilities for Java development. First of all, an attempt will be made to install a JDT.LS server using nvim-lsp-Innstaller. Then, if necessary, java-debug will be installed in JDT.LS to debug applications. Also, if necessary, the jol utility will be downloaded and collected to analyze objects.

Debugging with VIMSPector

The plugin allows you to use VimSpector to debug the applications. There are several commands for that:

Refactoring

With the help of nvim-jtdls, extracts of methods and variables are implemented. There are commands to use these methods:

Utilities

Usage

For a quick start, the next configuration is sufficient:

call plug#begin('~/.vim/plugged') 

Plug 'neovim/nvim-lspconfig'
Plug 'hrsh7th/nvim-cmp' 
Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'williamboman/nvim-lsp-installer'
Plug 'puremourning/vimspector'
Plug 'mfussenegger/nvim-jdtls'
Plug 'artur-shaik/jc.nvim'

call plug#end()

lua require('jc').setup{}

After installing all plugins and rebooting vim, when the Java file is opened jc.nvim will check the presence of all the necessary utilities and, if necessary, install the missing ones.