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

@@ -140,13 +140,18 @@
     initFormat(&splash->screenFormat, 0xff << 8,
             0xff << 16, 0xff << 24, 0xff << 0);
     splash->screenFormat.byteOrder = 1 ?  BYTE_ORDER_LSBFIRST : BYTE_ORDER_MSBFIRST;
     splash->screenFormat.depthBytes = 4;
 
+    // If this property is present we are running SWT and should not start a runLoop
+    char envVar[80];
+    snprintf(envVar, sizeof(envVar), "JAVA_STARTED_ON_FIRST_THREAD_%d", getpid());
+    if (getenv(envVar) == NULL) {
     [JNFRunLoop performOnMainThreadWaiting:NO withBlock:^() {
         [NSApplicationAWT runAWTLoopWithApp:[NSApplicationAWT sharedApplication]];
     }];
+    }
 }
 
 void
 SplashCleanupPlatform(Splash * splash) {
     splash->maskRequired = 0;