Throw JS exception instead of Java wrapping object

Author: Zbynek Konecny

gwt-core-gwt2-tests/src/test/java/org/gwtproject/core/client/GWTTest.java

@@ -45,7 +45,7 @@ public void testReportUncaughtError() {
     DomGlobal.setTimeout(
         (ignore) -> {
           assertEquals(1, caught.size());
-          assertEquals("java.lang.JsException", caught.get(0).getClass().getName());
+          assertEquals("java.lang.RuntimeException", caught.get(0).getClass().getName());
           finishTest();
         },
         1000);

gwt-core/src/main/java/org/gwtproject/core/client/GWT.java

@@ -17,6 +17,7 @@
 
 import elemental2.dom.DomGlobal;
 import elemental2.dom.Window;
+import jsinterop.annotations.JsFunction;
 import jsinterop.annotations.JsMethod;
 import jsinterop.annotations.JsType;
 import jsinterop.base.Js;
@@ -58,11 +59,10 @@ public static <T> T create(Class<?> clazz) {
   public static void reportUncaughtException(Throwable e) {
     // throw an exception "later" so that it ends up handled by the global
     // error handler. Same code as in GWT2's Impl.reportToBrowser()
-    DomGlobal.setTimeout(
-        ignore -> {
-          throw_(e);
-        },
-        0);
+    setTimeout(
+        () -> {
+          throw e;
+        });
   }
 
   /**
@@ -160,8 +160,13 @@ private static class InnerWindow {
     static Window window;
   }
 
-  @JsMethod(namespace = "<window>", name = "throw")
-  private static native void throw_(Object object);
+  @JsFunction
+  private interface Throwing {
+    void run() throws Throwable;
+  }
+
+  @JsMethod(namespace = "<window>", name = "setTimeout")
+  private static native void setTimeout(Throwing throwingFunction);
 
   public static boolean isClient() {
     return org.gwtproject.core.shared.GWT.isClient();