Исправление фикса для 1.12

LaunchServer/src/main/resources/ru/gravit/launchserver/defaults/proguard.cfg

@@ -16,6 +16,7 @@
 -repackageclasses 'ru.gravit.launcher'
 -keep class ru.zaxar163.*
 -keep class cpw.mods.fml.*
+-keep class net.minecraftforge.fml.*
 -keepattributes SourceFile,LineNumberTable,*Annotation*
 -renamesourcefileattribute SourceFile
 -keepattributes Signature

libLauncher/src/main/java/cpw/mods/fml/SafeExitJVMLegacy.java

@@ -0,0 +1,9 @@
+package cpw.mods.fml;
+// FMLSecurityManager запрещает делать System.exit из классов
+// Не входящих в пакеты самого Forge
+public class SafeExitJVMLegacy {
+    public static void exit(int code)
+    {
+        System.exit(code);
+    }
+}

libLauncher/src/main/java/net/minecraftforge/fml/SafeExitJVM.java

@@ -1,4 +1,4 @@
-package cpw.mods.fml;
+package net.minecraftforge.fml;
 // FMLSecurityManager запрещает делать System.exit из классов
 // Не входящих в пакеты самого Forge
 public class SafeExitJVM {

libLauncher/src/main/java/ru/gravit/launcher/hasher/DirWatcher.java

@@ -15,7 +15,8 @@
 import java.util.LinkedList;
 import java.util.Objects;
 
-import cpw.mods.fml.SafeExitJVM;
+import cpw.mods.fml.SafeExitJVMLegacy;
+import net.minecraftforge.fml.SafeExitJVM;
 import ru.gravit.launcher.LauncherAPI;
 import ru.gravit.launcher.hasher.HashedEntry.Type;
 import ru.gravit.utils.helper.IOHelper;
@@ -67,8 +68,13 @@ public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) th
 
     private static void handleError(Throwable e) {
         LogHelper.error(e);
+        try {
+            SafeExitJVMLegacy.exit(-123);
+        } catch (Throwable ignored)
+        {
             SafeExitJVM.exit(-123);
         }
+    }
 
     private static Deque<String> toPath(Iterable<Path> path) {
         Deque<String> result = new LinkedList<>();