From 1883dde9773e9f878731abae3cf5c12ac7b00e67 Mon Sep 17 00:00:00 2001
From: tomikun <60690056+alexytomi@users.noreply.github.com>
Date: Thu, 7 May 2026 21:29:02 +0800
Subject: [PATCH] fix: Error parsing JVM args when JSON missing arguments field

---
 .../main/java/net/kdt/pojavlaunch/Tools.java  | 62 +++++++++----------
 1 file changed, 31 insertions(+), 31 deletions(-)

diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
index 76239b10a..2f45c47ae 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
@@ -735,6 +735,8 @@ public final class Tools {
 
     public static String[] getMinecraftJVMArgs(String versionName, File gameDir) {
         JMinecraftVersionList.Version versionInfo = Tools.getVersionInfo(versionName, true);
+        if (versionInfo.arguments == null || versionInfo.arguments.jvm == null)
+            return new String[0];
 
         Map<String, String> varArgMap = new ArrayMap<>();
         varArgMap.put("classpath_separator", ":");
@@ -743,39 +745,37 @@ public final class Tools {
         varArgMap.put("natives_directory", Tools.DIR_CACHE.getAbsolutePath());
 
         List<String> minecraftArgs = new ArrayList<>();
-        if (versionInfo.arguments.jvm != null) {
-            for (Object arg : versionInfo.arguments.jvm) {
-                if (arg instanceof String) {
-                    // These are defined later on
-                    if (((String) arg).contains("java.library.path")) {
-                        continue;
-                    }
-                    if (arg.equals("-cp")) {
-                        continue;
-                    }
-                    if (arg.equals("${classpath}")){
-                        continue;
-                    }
-                    // Should fix Forge 1.17.1-37.0.12 and older from crashing
-                    // Fixed in forge on https://github.com/MinecraftForge/MinecraftForge/pull/7919
-                    // Released as Forge 1.17.1-37.0.13 in https://maven.minecraftforge.net/net/minecraftforge/forge/1.17.1-37.0.13/forge-1.17.1-37.0.13-changelog.txt
-                    // yes this duplicates it, it's fine.
-                    // FIXME: Workaround old bootstraplauncher <0.1.17 buggy behaviour. See FCL workaround
-                    //  https://github.com/FCL-Team/FoldCraftLauncher/blob/00e96bcf8ddc8a550e9aba6091a73d5bee973b54/FCLCore/src/main/java/com/tungsten/fclcore/download/MaintainTask.java#L198-L200
-                    if (((String) arg).startsWith("-DignoreList=")){
-                        minecraftArgs.add(arg+",${version_name}.jar");
-                        continue;
-                    }
+        for (Object arg : versionInfo.arguments.jvm) {
+            if (arg instanceof String) {
+                // These are defined later on
+                if (((String) arg).contains("java.library.path")) {
+                    continue;
+                }
+                if (arg.equals("-cp")) {
+                    continue;
+                }
+                if (arg.equals("${classpath}")){
+                    continue;
+                }
+                // Should fix Forge 1.17.1-37.0.12 and older from crashing
+                // Fixed in forge on https://github.com/MinecraftForge/MinecraftForge/pull/7919
+                // Released as Forge 1.17.1-37.0.13 in https://maven.minecraftforge.net/net/minecraftforge/forge/1.17.1-37.0.13/forge-1.17.1-37.0.13-changelog.txt
+                // yes this duplicates it, it's fine.
+                // FIXME: Workaround old bootstraplauncher <0.1.17 buggy behaviour. See FCL workaround
+                //  https://github.com/FCL-Team/FoldCraftLauncher/blob/00e96bcf8ddc8a550e9aba6091a73d5bee973b54/FCLCore/src/main/java/com/tungsten/fclcore/download/MaintainTask.java#L198-L200
+                if (((String) arg).startsWith("-DignoreList=")){
+                    minecraftArgs.add(arg+",${version_name}.jar");
+                    continue;
+                }
 
-                    // TODO: Implement adding launcher brand and version
-                    if (((String) arg).contains("minecraft.launcher.brand") ||
-                        ((String) arg).contains("minecraft.launcher.version")) {
-                        continue;
-                    }
+                // TODO: Implement adding launcher brand and version
+                if (((String) arg).contains("minecraft.launcher.brand") ||
+                    ((String) arg).contains("minecraft.launcher.version")) {
+                    continue;
+                }
 
-                    minecraftArgs.add((String) arg);
-                } //TODO: implement (?maybe?)
-            }
+                minecraftArgs.add((String) arg);
+            } //TODO: implement (?maybe?)
         }
         return JSONUtils.insertJSONValueList(minecraftArgs.toArray(new String[0]), varArgMap);
     }