Java version error.

[BodeaPeGitHub]

Hello, I can't make my jdtls to work.
My JAVA_HOME variable refers java 8 but i've specified in my config the path to java 20.
This is my config: (I'm on windows)

local config = {
  -- The command that starts the language server
  -- See: https://github.com/eclipse/eclipse.jdt.ls#running-from-the-command-line
  cmd = {

    'C:\\Users\\BodeaOnGitHub\\apps\\jdk-20.0.2\\bin\\java',
    '-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', 'C:\\Users\\BodeaPeGitHub\\AppData\\Local\\nvim-data\\mason\\packages\\jdtls\\plugins\\org.eclipse.equinox.launcher_1.6.500.v20230717-2134.jar',
    '-configuration', 'C:\\Users\\BodeaPeGitHub\\AppData\\Local\\nvim-data\\mason\\packages\\jdtls\\config_win',

    -- See `data directory configuration` section in the README
    '-data', workspace_dir,

  },

  -- 💀
  -- 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 = {}
  },
}

If i call: C:\\Users\\BodeaOnGitHub\\apps\\jdk-20.0.2\\bin\\java -version i get the following output:

java version "20.0.2" 2023-07-18
Java(TM) SE Runtime Environment (build 20.0.2+9-78)
Java HotSpot(TM) 64-Bit Server VM (build 20.0.2+9-78, mixed mode, sharing)

But when i'm opening a .java file with neovim I get the "Client x stoped with exit code 1 and signal 0" and the following error in the logs:

`Traceback (most recent call last):\r\n  File "C:\\\\Users\\\\BodeaPeGitHub\\\\AppData\\\\Local\\\\nvim-data\\\\mason\\\\packages\\\\jdtls\\\\bin/jdtls", line 17, in <module>\r\n'
	"    jdtls.main(sys.argv[1:])\r\n"
	'  File "C:\\Users\\BodeaPeGitHub\\AppData\\Local\\nvim-data\\mason\\packages\\jdtls\\bin\\jdtls.py", line 82, in main\r\n'
	"    java_executable = get_java_executable(known_args.validate_java_version)\r\n"
	'                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File "C:\\Users\\BodeaPeGitHub\\AppData\\Local\\nvim-data\\mason\\packages\\jdtls\\bin\\jdtls.py", line 40, in get_java_executable\r\n'
	'    raise Exception("jdtls requires at least Java 17")\r\n'
	"Exception: jdtls requires at least Java 17\r\n"` 

How can i fix it?

[mfussenegger]

The error message is coming from:

C:\\Users\\BodeaPeGitHub\\AppData\\Local\\nvim-data\\mason\\packages\\jdtls\\bin\\jdtls.py"

And the config you show is using

 'C:\\Users\\BodeaOnGitHub\\apps\\jdk-20.0.2\\bin\\java',

Which means the error must be coming from elsewhere. Are you using lspconfig in addition? Or some other lsp plugin?
If it's lspconfig. Don't call jdtls.setup().

[BodeaPeGitHub]

This is my lsp.lua file:

local lsp = require("lsp-zero")

lsp.preset("recommended")

-- Fix Undefined global 'vim'
lsp.nvim_workspace()


local cmp = require('cmp')
local cmp_select = {behavior = cmp.SelectBehavior.Select}
local cmp_mappings = lsp.defaults.cmp_mappings({
  ['<C-p>'] = cmp.mapping.select_prev_item(cmp_select),
  ['<C-o>'] = cmp.mapping.select_next_item(cmp_select),
  ['<C-y>'] = cmp.mapping.confirm({ select = true }),
  ["<C-Space>"] = cmp.mapping.complete(),
})

cmp_mappings['<Tab>'] = nil
cmp_mappings['<S-Tab>'] = nil

lsp.setup_nvim_cmp({
  mapping = cmp_mappings
})

lsp.set_preferences({
    suggest_lsp_servers = false,
    sign_icons = {
        error = 'E',
        warn = 'W',
        hint = 'H',
        info = 'I'
    }
})

lsp.on_attach(function(client, bufnr)
  local opts = {buffer = bufnr, remap = false}

  vim.keymap.set("n", "gd", function() vim.lsp.buf.definition() end, opts)
  vim.keymap.set("n", "K", function() vim.lsp.buf.hover() end, opts)
  vim.keymap.set("n", "<leader>vws", function() vim.lsp.buf.workspace_symbol() end, opts)
  vim.keymap.set("n", "<leader>vd", function() vim.diagnostic.open_float() end, opts)
  vim.keymap.set("n", "[d", function() vim.diagnostic.goto_next() end, opts)
  vim.keymap.set("n", "]d", function() vim.diagnostic.goto_prev() end, opts)
  vim.keymap.set("n", "<leader>vca", function() vim.lsp.buf.code_action() end, opts)
  vim.keymap.set("n", "<leader>vrr", function() vim.lsp.buf.references() end, opts)
  vim.keymap.set("n", "<leader>vrn", function() vim.lsp.buf.rename() end, opts)
  vim.keymap.set("i", "<C-h>", function() vim.lsp.buf.signature_help() end, opts)
end)

lsp.setup({
    cmd = { 'jdtls' , "--add-modules jdk.incubator.vector" },
    on_stderr = function(err)
        print('Error:', err)
    end
})

vim.diagnostic.config({
    virtual_text = true
})

require("nvim-lsp-installer").setup({
    automatic_installation = true, -- automatically detect which servers to install (based on which servers are set up via lspconfig)
    ui = {
        icons = {
            server_installed = "✓",
            server_pending = "➜",
            server_uninstalled = "✗"
        }
    }
})

What shouldn't i call?

[mfussenegger]

lsp-zero even has docs for using it with nvim-jdtls, please read them: https://github.com/VonHeikemen/lsp-zero.nvim/blob/v2.x/doc/md/guides/setup-with-nvim-jdtls.md