kickstart.nvim/ftplugin/java.lua

-- JDTLS (Java LSP) configuration
local home = vim.env.HOME -- Get the home directory

local jdtls = require 'jdtls'
local project_name = vim.fn.fnamemodify(vim.fn.getcwd(), ':p:h:t')
local workspace_dir = home .. '/jdtls-workspace/' .. project_name

local system_os = ''

-- Determine OS
if vim.fn.has 'mac' == 1 then
  system_os = 'mac'
elseif vim.fn.has 'unix' == 1 then
  system_os = 'linux'
elseif vim.fn.has 'win32' == 1 or vim.fn.has 'win64' == 1 then
  system_os = 'win'
else
  print "OS not found, defaulting to 'linux'"
  system_os = 'linux'
end

-- Needed for debugging
local bundles = {
  vim.fn.glob(home .. '/.local/share/nvim/mason/share/java-debug-adapter/com.microsoft.java.debug.plugin.jar'),
}

-- Needed for running/debugging unit tests
vim.list_extend(bundles, vim.split(vim.fn.glob(home .. '/.local/share/nvim/mason/share/java-test/*.jar', 1), '\n'))

-- 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 = {
    '/home/lucas/.sdkman/candidates/java/21.0.2-open/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',
    '-javaagent:' .. home .. '/.local/share/nvim/mason/share/jdtls/lombok.jar',
    '-Xms4g',
    '-Xmx8g',
    '--add-modules=ALL-SYSTEM',
    '--add-opens',
    'java.base/java.util=ALL-UNNAMED',
    '--add-opens',
    'java.base/java.lang=ALL-UNNAMED',

    -- Eclipse jdtls location
    '-jar',
    home .. '/.local/share/nvim/mason/share/jdtls/plugins/org.eclipse.equinox.launcher.jar',
    '-configuration',
    home .. '/.local/share/nvim/mason/packages/jdtls/config_' .. system_os,
    '-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 = vim.fs.root(0, { '.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
  settings = {
    java = {
      home = '/home/lucas/.sdkman/candidates/java/21.0.2-open',
      eclipse = {
        downloadSources = true,
      },
      configuration = {
        updateBuildConfiguration = 'interactive',
        -- TODO Update this by adding any runtimes that you need to support your Java projects and removing any that you don't have installed
        -- The runtime name parameters need to match specific Java execution environments.  See https://github.com/tamago324/nlsp-settings.nvim/blob/2a52e793d4f293c0e1d61ee5794e3ff62bfbbb5d/schemas/_generated/jdtls.json#L317-L334
        runtimes = {
          {
            name = 'JavaSE-11',
            path = '/home/lucas/.sdkman/candidates/java/11.0.22-ms',
          },
          {
            name = 'JavaSE-21',
            path = '/home/lucas/.sdkman/candidates/java/21.0.2-open',
          },
        },
      },
      maven = {
        downloadSources = true,
      },
      implementationsCodeLens = {
        enabled = true,
      },
      referencesCodeLens = {
        enabled = true,
      },
      references = {
        includeDecompiledSources = true,
      },
      signatureHelp = { enabled = true },
      format = {
        enabled = true,
        -- Formatting works by default, but you can refer to a specific file/URL if you choose
        settings = {
          url = '/home/lucas/magna-sistemas-java-code-formatter.xml',
        },
      },
      completion = {
        favoriteStaticMembers = {
          'org.hamcrest.MatcherAssert.assertThat',
          'org.hamcrest.Matchers.*',
          'org.hamcrest.CoreMatchers.*',
          'org.junit.jupiter.api.Assertions.*',
          'java.util.Objects.requireNonNull',
          'java.util.Objects.requireNonNullElse',
          'org.mockito.Mockito.*',
        },
        importOrder = {
          'java',
          'javax',
          'jakarta',
          'lombok',
          'springfox',
          'org',
          'com',
          'io',
          'br',
        },
      },
      sources = {
        organizeImports = {
          starThreshold = 9999,
          staticStarThreshold = 9999,
        },
      },
      codeGeneration = {
        toString = {
          template = '${object.className}{${member.name()}=${member.value}, ${otherMembers}}',
        },
        useBlocks = true,
      },
    },
  },
  -- Needed for auto-completion with method signatures and placeholders
  capabilities = require('blink.cmp').get_lsp_capabilities(),
  flags = {
    allow_incremental_sync = true,
  },
  init_options = {
    -- References the bundles defined above to support Debugging and Unit Testing
    bundles = bundles,
    extendedClientCapabilities = jdtls.extendedClientCapabilities,
  },
}

-- Needed for debugging
config['on_attach'] = function(client, bufnr)
  jdtls.setup_dap { hotcodereplace = 'auto' }
  require('jdtls.dap').setup_dap_main_class_configs()
end

-- This starts a new client & server, or attaches to an existing client & server based on the `root_dir`.
jdtls.start_or_attach(config)