eclipse.jdt.ls VS coc.nvim

Thanks Eclipse : https://github.com/eclipse-jdtls/eclipse.jdt.ls

I installed eclipse jdtls which worked for Java, but I was not able to go to definitions for methods/classes outside of my project (ie, libraries and such, something like in IntelliJ where you can go to the definition or implementation for the library code), so I thought it may be a limitation of nvim-lspconfig

return { { "neovim/nvim-lspconfig", dependencies = { "mfussenegger/nvim-jdtls", init = function() require("lazyvim.util").on_attach(function(_, buffer) -- stylua: ignore vim.keymap.set( "n", "di", "lua require'jdtls'.organize_imports()", { buffer = buffer, desc = "Organize Imports" } ) vim.keymap.set( "n", "dt", "lua require'jdtls'.test_class()", { buffer = buffer, desc = "Test Class" } ) vim.keymap.set( "n", "dn", "lua require'jdtls'.test_nearest_method()", { buffer = buffer, desc = "Test Nearest Method" } ) vim.keymap.set( "v", "de", "lua require('jdtls').extract_variable(true)", { buffer = buffer, desc = "Extract Variable" } ) vim.keymap.set( "n", "de", "lua require('jdtls').extract_variable()", { buffer = buffer, desc = "Extract Variable" } ) vim.keymap.set( "v", "dm", "lua require('jdtls').extract_method(true)", { buffer = buffer, desc = "Extract Method" } ) vim.keymap.set( "n", "cf", "lua vim.lsp.buf.formatting()", { buffer = buffer, desc = "Format" } ) end) end, }, ---@class PluginLspOpts opts = { ---@type lspconfig.options servers = {}, -- you can do any additional lsp server setup here -- return true if you don't want this server to be setup with lspconfig ---@type table setup = { -- example to setup with typescript.nvim jdtls = function(_, opts) local project_name = vim.fn.fnamemodify(vim.fn.getcwd(), ":p:h:t") -- vim.lsp.set_log_level('DEBUG') local workspace_dir = "/home/jake/.workspace/" .. project_name -- See `:help vim.lsp.start_client` for an overview of the supported `config` options. local config = { -- The command that starts the language server -- See: https://github.com/eclipse/eclipse.jdt.ls#running-from-the-command-line cmd = { "java", -- or '/path/to/java17_or_newer/bin/java' "-javaagent:/home/jake/.local/share/java/lombok.jar", -- '-Xbootclasspath/a:/home/jake/.local/share/java/lombok.jar', "-Declipse.application=org.eclipse.jdt.ls.core.id1", "-Dosgi.bundles.defaultStartLevel=4", "-Declipse.product=org.eclipse.jdt.ls.core.product", "-Dlog.protocol=true", "-Dlog.level=ALL", -- '-noverify', "-Xms1g", "--add-modules=ALL-SYSTEM", "--add-opens", "java.base/java.util=ALL-UNNAMED", "--add-opens", "java.base/java.lang=ALL-UNNAMED", "-jar", vim.fn.glob("/usr/share/java/jdtls/plugins/org.eclipse.equinox.launcher_*.jar"), "-configuration", "/usr/share/java/jdtls/config_linux", "-data", workspace_dir, }, root_dir = require("jdtls.setup").find_root({ ".git", "mvnw", "gradlew" settings = { java = {}, }, } require("jdtls").start_or_attach(config) return true end, -- Specify * to use this function as a fallback for any server -- ["*"] = function(server, opts) end, }, }, }, }

You can absolutely just use Gradle on the command line, and use a language server to get code intelligence in pretty much any editor you like. IntelliJ is very nice, especially for refactoring, but it doesn't have a giant advantage over any other editor, as long as you're sticking to mostly Java.

Try neovim. Builtin support for language servers which provide the basis for IDE functionality, autocomplete, auto import, code actions, refactoring, etc. I believe VSCode uses jdtls on the backend and you can use the same thing with neovim.

Is seems like valid manual to start language server here https://github.com/eclipse/eclipse.jdt.ls. Not sure what you mean by "starting it with other editors" though. It should be covered by editor own integration with the given LS.

But all of the above to say that Emacs can have the ability to some of if not more than VSCode. As others have said, the Jetbrains IDEs are a different story. They're built to actually understand the code you're writing. It's quite possible, with features like auto-insert and skeletons, to replicate some of the functionality that, say, IntelliJ does. For example, say you find-file into a new file for some Java project. When you first enter the buffer, you could setup a prompt to create a class, enum, interface etc. and then upon a selection, you have the basic relevant code for whatever the selection was made auto-inserted. Or you could just quit the prompt with C-g. Granted that takes some time to set up as well as recreating other smaller features that IntelliJ has. JDTLS can do some of this, but at the end of the day it's not a replacement for IntelliJ and I don't think JDTLS intends to be such.

Just the other day I tested VS Code Java again and apparently the Red Hat team that did the Java language support has gotten some level of null analysis turned on now. Thus I assume the Eclipse LSP https://github.com/eclipse/eclipse.jdt.ls has that support now.

As well as its own plugins Vim/NeoVim can use VSCode's LSPs, DAPs and extensions either directly or via plugins like CoC[1] and Mason[2].

I would be surprised if emacs couldn't do the same.

1. https://github.com/neoclide/coc.nvim

The most famous TypeScript one probably is coc.nvim

It is flatly the wrong mindset to think of vim as an IDE. vim is a code editor: get in, make change, get out. Consider vim koans, which are a fun little read. You can throw coc.nvim at Neovim, along with a few other bits to give you a Good Enough setup, but vim isn't and will never be an IDE.

I just did a fresh reinstall of CoC, on a newer version of Neovim. I'm now seeing something I hadn't seen before, which CoC calls "inlay hints". They look like this:

I'm currently on an old setup (using coc and polyglot) and nvim v0.6.1. I'll be updating to a more modern setup within next year, using the native lsp and building nvim more frequently. But that's not today.

coc.nvim

There are some plugins which have the best documentations I have ever seen, but you need to read it from the Vim.

Example of coc.nvim: https://github.com/neoclide/coc.nvim/blob/master/doc/coc.txt

Actually you can with coc.nvim & coc-sh. So long as shellcheck is also installed and in PATH, it'll integrate with coc/vim just fine.

When you install an extension it runs an npm install or yarn, iirc, which is going to be problematic for you being offline. I was going to say you could copy that ~/.config/coc folder directly to the other machine but yeah, Windows, no idea. You see here https://github.com/neoclide/coc.nvim/wiki/Using-coc-extensions

You can try https://github.com/neoclide/coc.nvim, the pre-requisite is to install nodeJS, then to install all the languages LSP. This works for me for Angular, Rust, JavaScript, Vimscript, etc