src/macosx/native/sun/awt/splashscreen/splashscreen_sys.m

@@ -128,11 +128,15 @@
 char* SplashGetScaledImageName(const char* jar, const char* file,
                                float *scaleFactor) {
     NSAutoreleasePool *pool = [NSAutoreleasePool new];
     *scaleFactor = 1;
     char* scaledFile = nil;
-    float screenScaleFactor = [SplashNSScreen() backingScaleFactor];
+    __block float screenScaleFactor = 1;
+
+    [JNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){
+        screenScaleFactor = [SplashNSScreen() backingScaleFactor];
+    }];
     
     if (screenScaleFactor > 1) {
         NSString *fileName = [NSString stringWithUTF8String: file];
         NSUInteger length = [fileName length];
         NSRange range = [fileName rangeOfString: @"."