better jdtls handle

Author: aceforeverd

bin/java-lsp

@@ -2,22 +2,64 @@
 
 set -eE
 
-if [ $# -ne 3 ]; then
-  echo "Usage: $0 {ROOT_PATH} {CFG_PATH} {WORKSPACE_PATH}"
-  exit 1
-fi
+#===  FUNCTION  ================================================================
+#         NAME:  usage
+#  DESCRIPTION:  Display usage information.
+#===============================================================================
+function usage ()
+{
+  echo "Usage :  $0 [options] [--]
+
+    Options:
+    -j            path to JAVA_HOME
+    -r            ROOT DIRECTORY
+    -c            JDTLS config path
+    -d            JDTLS workspace path
+    -h|help       Display this message"
+
+}    # ----------  end of function usage  ----------
+
+#-----------------------------------------------------------------------
+#  Handle command line arguments
+#-----------------------------------------------------------------------
+
+JAVA_EXE=java
+JAVA_HOME=
+_ROOT_DIR=
+_CFG_PATH=
+_WORKSPACE_DIR=
+while getopts ":hj:r:c:d:" opt
+do
+  case $opt in
+
+  h)  usage; exit 0   ;;
+
+  j) JAVA_HOME=$OPTARG ;;
 
-# assume _ROOT_DIR, _CFG_PATH, _WORKSPACE_DIR all absolute path
-_ROOT_DIR=$1
-_CFG_PATH=$2
-_WORKSPACE_DIR=$3
+  r) _ROOT_DIR=$OPTARG ;;
+
+  c) _CFG_PATH=$OPTARG ;;
+
+  d) _WORKSPACE_DIR=$OPTARG ;;
+
+  * )  echo -e "\n  Option does not exist : $OPTARG\n"
+      usage; exit 1   ;;
+
+  esac    # --- end of case ---
+done
+shift $((OPTIND-1))
 
 pushd "$_ROOT_DIR"
 
 JAR="$_ROOT_DIR/plugins/org.eclipse.equinox.launcher_*.jar"
 
+if [ ! -d "$JAVA_HOME" ] ; then
+  echo "JAVA HOME $JAVA_HOME not exist"
+  exit 1
+fi
+JAVA_EXE="$JAVA_HOME/bin/java"
+
 _DEBUG_OPTS=
-JAVA_PRG=$(command -v java || echo java)
 if [[ -n "$DEBUG" ]]; then
   # note jdtls will fail if other precess runs on port 1044
   _DEBUG_OPTS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=1044
@@ -35,7 +77,7 @@ fi
 # 1. https://github.com/mfussenegger/nvim-jdtls#configuration
 # 2. https://github.com/eclipse/eclipse.jdt.ls#running-from-the-command-line
 # shellcheck disable=SC2086
-exec $JAVA_PRG $_DEBUG_OPTS $_LOMBOK_OPT \
+exec $JAVA_EXE $_DEBUG_OPTS $_LOMBOK_OPT \
   -Declipse.application=org.eclipse.jdt.ls.core.id1 \
   -Dosgi.bundles.defaultStartLevel=4 \
   -Declipse.product=org.eclipse.jdt.ls.core.product \

lua/aceforeverd/lsp/jdtls.lua

@@ -15,6 +15,26 @@
 
 local M = {}
 
+
+local function search_jdk_runtimes()
+  local runtimes = {}
+  local sdkman_java_candidates = '~/.sdkman/candidates/java/'
+  local jdk_versions = { '8', '11', '17', '21', '22', '18' }
+  for _, version in ipairs(jdk_versions) do
+    local path = vim.fn.glob(sdkman_java_candidates .. version .. '.*', true, true)
+    if #path > 0 then
+      table.insert(runtimes, { name = 'JDK' .. version, path = path[1] })
+    end
+  end
+
+  local system_default = vim.fn.system({ 'java-config', '-O' })
+  if vim.v.shell_error == 0 then
+    table.insert(runtimes, { name = 'System Default', path = string.gsub(system_default, "%s+$", '') })
+  end
+
+  return runtimes
+end
+
 function M.jdtls()
   local mason_registery = require('mason-registry')
   local server = mason_registery.get_package('jdtls')
@@ -34,7 +54,16 @@ function M.jdtls()
   local extendedClientCapabilities = jdtls.extendedClientCapabilities
   extendedClientCapabilities.resolveAdditionalTextEditsSupport = true
 
-  -- TODO: check java version, jdtls requires JAVA >= 17
+  -- Finding supported Java in sdkman
+  -- or u can search in more locations
+  local javas = vim.fn.glob('~/.sdkman/candidates/java/{21,20,17,22,18,19}*', true, true)
+  local java_home
+  if #javas > 0 then
+    java_home = javas[1]
+  else
+    java_home = os.getenv('JAVA_HOME')
+  end
+  -- TODO: build a JDK table dynamically to 'settings.java.configuration' ?
 
   local cfg_file
   if vim.fn.has('mac') == 1 then
@@ -54,7 +83,13 @@ function M.jdtls()
   local workspace_dir = data_path .. '/jdtls-ws/' .. prj_name
 
   local config = vim.tbl_deep_extend('force', {
-    cmd = { config_path .. '/bin/java-lsp', dir, dir .. '/' .. cfg_file, workspace_dir },
+    cmd = {
+      config_path .. '/bin/java-lsp',
+      '-r', dir,
+      '-c', dir .. '/' .. cfg_file,
+      '-d', workspace_dir,
+      '-j', java_home,
+    },
     settings = {
       -- https://github.com/mfussenegger/dotfiles/blob/master/vim/.config/nvim/ftplugin/java.lua
       java = {
@@ -103,8 +138,9 @@ function M.jdtls()
           },
           useBlocks = true,
         },
-        -- runtimes = {
-        -- },
+        configuration = {
+          runtimes = search_jdk_runtimes(),
+        }
       },
     },
     flags = {