Accept both simple string and list of strings in args fields for debug config

debug_adapter_schemas/Java.json

@@ -19,12 +19,32 @@
           "description": "The fully qualified name of the class containing the main method. If not specified, the debugger automatically resolves the possible main class from the current project."
         },
         "args": {
-          "type": "string",
-          "description": "The command line arguments passed to the program."
+          "oneOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            }
+          ],
+          "description": "The command line arguments passed to the program. Can be a single string or an array of strings."
         },
         "vmArgs": {
-          "type": "string",
-          "description": "The extra options and system properties for the JVM (e.g., -Xms<size> -Xmx<size> -D<name>=<value>)."
+          "oneOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            }
+          ],
+          "description": "The extra options and system properties for the JVM (e.g., -Xms<size> -Xmx<size> -D<name>=<value>). Can be a single string or an array of strings."
         },
         "encoding": {
           "type": "string",

src/debugger.rs

@@ -13,8 +13,8 @@ use crate::{
     config::get_java_debug_jar,
     lsp::LspWrapper,
     util::{
-        create_path_if_not_exists, get_curr_dir, mark_checked_once, path_to_string,
-        should_use_local_or_download,
+        ArgsStringOrList, create_path_if_not_exists, get_curr_dir, mark_checked_once,
+        path_to_string, should_use_local_or_download,
     },
 };
 
@@ -27,9 +27,9 @@ struct JavaDebugLaunchConfig {
     #[serde(skip_serializing_if = "Option::is_none")]
     main_class: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
-    args: Option<String>,
+    args: Option<ArgsStringOrList>,
     #[serde(skip_serializing_if = "Option::is_none")]
-    vm_args: Option<String>,
+    vm_args: Option<ArgsStringOrList>,
     #[serde(skip_serializing_if = "Option::is_none")]
     encoding: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]

src/util.rs

@@ -1,4 +1,5 @@
 use regex::Regex;
+use serde::{Deserialize, Serialize, Serializer};
 use std::{
     env::current_dir,
     fs,
@@ -401,3 +402,26 @@ pub fn should_use_local_or_download(
         CheckUpdates::Always => Ok(None),
     }
 }
+
+/// A type that can be deserialized from either a single string or a list of strings.
+///
+/// When serialized, it always produces a single string. If it was a list,
+/// the elements are joined with a space.
+#[derive(Deserialize, Debug, Clone)]
+#[serde(untagged)]
+pub enum ArgsStringOrList {
+    String(String),
+    List(Vec<String>),
+}
+
+impl Serialize for ArgsStringOrList {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match self {
+            ArgsStringOrList::String(s) => serializer.serialize_str(s),
+            ArgsStringOrList::List(l) => serializer.serialize_str(&l.join(" ")),
+        }
+    }
+}