resolved issue #20 - Hidden JSinstance info ... raised

src/jni/MetadataNode.cpp

@@ -1344,11 +1344,13 @@ void MetadataNode::SetterCallback(Local<String> property, Local<Value> value, co
 		{
 			if(first.isFinal)
 			{
-				Isolate *isolate(Isolate::GetCurrent());
-				Handle<String> exceptionMessage = ConvertToV8String("You are trying to SET a final field! Final fields can only be read.");
-				Local<Value> IllegalAccessException(exceptionMessage);
+				stringstream ss;
+				ss << "You are trying to SET \"" << first.name << "\" which is a final field! Final fields can only be read.";
+				string exceptionMessage = ss.str();
 
-				isolate->ThrowException(IllegalAccessException);
+				Isolate *isolate(Isolate::GetCurrent());
+				isolate->ThrowException(v8::Exception::Error((ConvertToV8String(exceptionMessage))));
+				return;
 			}
 			s_setJavaField(thiz, value, node->m_name, first.name, first.sig, first.declaringType, first.isStatic);
 

src/jni/NativeScriptRuntime.cpp

@@ -186,6 +186,16 @@ void NativeScriptRuntime::CallJavaMethod(const Handle<Object>& caller, const str
 	if (!isStatic)
 	{
 		callerJavaObject = objectManager->GetJavaObjectByJsObject(caller);
+		if(callerJavaObject == nullptr)
+		{
+			Isolate *isolate = Isolate::GetCurrent();
+			stringstream ss;
+			ss << "No java object found on which to call \"" << methodName << "\" method. It is possible your Javascript object is not linked with the corresponding Java class. Try passing context(this) to the constructor function.";
+			string exceptionMessage = ss.str();
+			isolate->ThrowException(v8::Exception::ReferenceError(ConvertToV8String(exceptionMessage)));
+			return;
+		}
+
 		if (isSuper)
 		{
 			clazz = env.FindClass(className);