eclipse.jdt.ls VS nvim-jdtls

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.

I recommend that you do not configure jdtls like the other language servers, it is better to use the nvim-jdtls plugin.

Java is actually pretty good with Neovim, jdtls and this plugin. One of the best language servers and I'm using it on a regular base with medium to large projects, mostly spring-based. No Android though.

-- 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' -- depends on if `java` is in your $PATH env variable and if it points to the right version. '-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', '-Xmx1g', '--add-modules=ALL-SYSTEM', '--add-opens', 'java.base/java.util=ALL-UNNAMED', '--add-opens', 'java.base/java.lang=ALL-UNNAMED', -- 💀 '-jar', '~/.local/share/nvim/mason/packages/jdtls/plugins/org.eclipse.equinox.launcher_1.6.500.v20230717-2134.jar', -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^ -- Must point to the Change this to -- eclipse.jdt.ls installation the actual version -- 💀 '-configuration', '~/.local/share/nvim/mason/packages/jdtls/config_linux', -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^ -- Must point to the Change to one of `linux`, `win` or `mac` -- eclipse.jdt.ls installation Depending on your system. -- 💀 -- See `data directory configuration` section in the README '-data', '/path/to/unique/per/project/workspace/folder' }, -- 💀 -- This is the default if not provided, you can remove it. Or adjust as needed. -- One dedicated LSP server & client will be started per unique root_dir root_dir = require('jdtls.setup').find_root({'.git', 'mvnw', 'gradlew'}), -- Here you can configure eclipse.jdt.ls specific settings -- See https://github.com/eclipse/eclipse.jdt.ls/wiki/Running-the-JAVA-LS-server-from-the-command-line#initialize-request -- for a list of options settings = { java = { } }, -- Language server `initializationOptions` -- You need to extend the `bundles` with paths to jar files -- if you want to use additional eclipse.jdt.ls plugins. -- -- See https://github.com/mfussenegger/nvim-jdtls#java-debug-installation -- -- If you don't plan on using the debugger or other eclipse.jdt.ls plugins you can remove this init_options = { bundles = {} }, } -- This starts a new client & server, -- or attaches to an existing client & server depending on the `root_dir`. require('jdtls').start_or_attach(config)

I can get by with https://github.com/mfussenegger/nvim-jdtls

This and this provided no viable solutions for me

I tried to configure jdtls for my NeoVim I followed https://github.com/mfussenegger/nvim-jdtls install instruction. and I faced this error does anyone successfully configured jdtls ? help T ^ T

Am I adding it to the wrong configuration option? Some places I see it added as a referencedLibary - https://github.com/mfussenegger/nvim-jdtls

Sure. Any server that lspconfig supports will work. But for java development is better if you use nvim-jdtls. The documentation in lsp-zero has a guide on how to setup nvim-jdtls.

Here' my java.lua for nvim-jdtls which solves the nil issue and add more features.