diff -r ad014e2245f6 webview/native/Source/WebCore/bridge/jni/jsc/JavaInstanceJSC.cpp
--- a/webview/native/Source/WebCore/bridge/jni/jsc/JavaInstanceJSC.cpp	Tue May 21 17:30:13 2013 -0700
+++ b/webview/native/Source/WebCore/bridge/jni/jsc/JavaInstanceJSC.cpp	Tue May 21 23:05:09 2013 -0700
@@ -261,8 +261,7 @@
           JSValue exceptionDescription
             = (JavaInstance::create(ex, rootObject, accessControlContext())
                ->createRuntimeObject(exec));
-          throwError(exec, createError(exec,
-                                       exceptionDescription.toString(exec)->value(exec)));
+          throwError(exec, exceptionDescription);
           return jsUndefined();
         }
     }
diff -r ad014e2245f6 webview/native/Source/WebCore/platform/java/BridgeUtils.cpp
--- a/webview/native/Source/WebCore/platform/java/BridgeUtils.cpp	Tue May 21 17:30:13 2013 -0700
+++ b/webview/native/Source/WebCore/platform/java/BridgeUtils.cpp	Tue May 21 23:05:09 2013 -0700
@@ -202,20 +202,20 @@
 static void throwJavaException(
     JNIEnv* env,
     JSContextRef ctx,
-    JSValueRef exception)
+    JSValueRef exception,
+    JSC::Bindings::RootObject* rootObject)
 {
     jclass clJSException = getJSExceptionClass(env);
-    static jmethodID constructorID =
-        env->GetMethodID(clJSException, "<init>",
-                        "(Ljava/lang/String;)V");
 
-    env->Throw(JLocalRef<jthrowable>((jthrowable)env->NewObject(
+    jobject jex = JSValue_to_Java_Object(exception, env, ctx, rootObject);
+    static jmethodID makeID =
+        env->GetStaticMethodID(clJSException, "make",
+                        "(Ljava/lang/Object;)Lnetscape/javascript/JSException;");
+
+    env->Throw(JLocalRef<jthrowable>((jthrowable)env->CallStaticObjectMethod(
             clJSException,
-            constructorID,
-            (jstring)JLString(WebCore::JSValue_to_Java_String(
-                exception,
-                env,
-                ctx)))));
+            makeID,
+            jex)));
 }
 
 jobject executeScript(
@@ -234,7 +234,7 @@
     JSValueRef value = JSEvaluateScript(ctx, script, object, NULL, 1, &exception);
     JSStringRelease(script);
     if (exception) {
-        throwJavaException(env, ctx, exception);
+        throwJavaException(env, ctx, exception, rootObject);
         return NULL;
     }
     return WebCore::JSValue_to_Java_Object(value, env, ctx, rootObject);
@@ -340,7 +340,7 @@
     JSObjectSetProperty(ctx, object, name, jsvalue, attributes, &exception);
     JSStringRelease(name);
     if (exception)
-        WebCore::throwJavaException(env, ctx, exception);
+        WebCore::throwJavaException(env, ctx, exception, rootObject.get());
 }
 
 JNIEXPORT void JNICALL Java_com_sun_webkit_dom_JSObject_removeMemberImpl
@@ -427,7 +427,7 @@
                                                &exception);
     delete[] arguments;
     if (exception) {
-        WebCore::throwJavaException(env, ctx, exception);
+        WebCore::throwJavaException(env, ctx, exception, rootObject.get());
         return NULL;
     }
     return WebCore::JSValue_to_Java_Object(result, env, ctx, rootObject.get());
diff -r ad014e2245f6 webview/src/netscape/javascript/JSException.java
--- a/webview/src/netscape/javascript/JSException.java	Tue May 21 17:30:13 2013 -0700
+++ b/webview/src/netscape/javascript/JSException.java	Tue May 21 23:05:09 2013 -0700
@@ -54,6 +54,18 @@
         this(s, null, -1, null, -1);
     }
 
+    public JSException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public static JSException make(Object value) {
+        String msg = value == null ? null : value.toString();
+        if (value instanceof Throwable)
+            return new JSException(msg, (Throwable) value);
+        else
+            return new JSException(msg);
+    }
+
 
     /**
      * <p> Construct a JSException object. This constructor is