[FIX] Possible multithreading issue

Launcher/src/main/java/pro/gravit/launcher/client/ClientLauncherEntryPoint.java

@@ -33,7 +33,6 @@
 import pro.gravit.launcher.utils.DirWatcher;
 import pro.gravit.utils.helper.*;
 
-import javax.swing.*;
 import java.io.File;
 import java.io.IOException;
 import java.lang.invoke.MethodHandle;
@@ -46,6 +45,7 @@
 import java.nio.file.SimpleFileVisitor;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.util.*;
+import java.util.concurrent.atomic.AtomicReference;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -241,20 +241,23 @@ public static void verifyHDir(Path dir, HashedDir hdir, FileNameMatcher matcher,
         // Hash directory and compare (ignore update-only matcher entries, it will break offline-mode)
         HashedDir currentHDir = new HashedDir(dir, matcher, true, digest);
         HashedDir.Diff diff = hdir.diff(currentHDir, matcher);
+        AtomicReference<String> latestPath = new AtomicReference<>("unknown");
         if (!diff.mismatch.isEmpty() || (checkExtra && !diff.extra.isEmpty())) {
             diff.extra.walk(File.separator, (e, k, v) -> {
                 if (v.getType().equals(HashedEntry.Type.FILE)) {
                     LogHelper.error("Extra file %s", e);
+                    latestPath.set(e);
                 } else LogHelper.error("Extra %s", e);
                 return HashedDir.WalkAction.CONTINUE;
             });
             diff.mismatch.walk(File.separator, (e, k, v) -> {
                 if (v.getType().equals(HashedEntry.Type.FILE)) {
                     LogHelper.error("Mismatch file %s", e);
+                    latestPath.set(e);
                 } else LogHelper.error("Mismatch %s", e);
                 return HashedDir.WalkAction.CONTINUE;
             });
-            throw new SecurityException(String.format("Forbidden modification: '%s'", IOHelper.getFileName(dir)));
+            throw new SecurityException(String.format("Forbidden modification: '%s' file '%s'", IOHelper.getFileName(dir), latestPath.get()));
         }
     }
 

LauncherCore/src/main/java11/pro/gravit/utils/Downloader.java

@@ -19,6 +19,7 @@
 import java.util.Queue;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
 
 public class Downloader {
@@ -28,7 +29,7 @@ public class Downloader {
     private static boolean isNoHttp2;
     protected final HttpClient client;
     protected final ExecutorService executor;
-    protected final LinkedList<DownloadTask> tasks = new LinkedList<>();
+    protected final Queue<DownloadTask> tasks = new ConcurrentLinkedDeque<>();
     protected CompletableFuture<Void> future;
     protected Downloader(HttpClient client, ExecutorService executor) {
         this.client = client;
@@ -128,15 +129,13 @@ protected DownloadTask sendAsync(AsyncDownloader.SizedFile file, URI baseUri, Pa
         IOHelper.createParentDirs(targetDir.resolve(file.filePath));
         ProgressTrackingBodyHandler<Path> bodyHandler = makeBodyHandler(targetDir.resolve(file.filePath), callback);
         CompletableFuture<HttpResponse<Path>> future = client.sendAsync(makeHttpRequest(baseUri, file.urlPath), bodyHandler);
-        var ref = new Object() {
-            DownloadTask task = null;
-        };
-        ref.task = new DownloadTask(bodyHandler, future.thenApply((e) -> {
-            tasks.remove(ref.task);
+        AtomicReference<DownloadTask> task = new AtomicReference<>(null);
+        task.set(new DownloadTask(bodyHandler, future.thenApply((e) -> {
+            tasks.remove(task.get());
             return e;
-        }));
-        tasks.add(ref.task);
-        return ref.task;
+        })));
+        tasks.add(task.get());
+        return task.get();
     }
 
     protected HttpRequest makeHttpRequest(URI baseUri, String filePath) throws URISyntaxException {