Developing Web Applications
with Google Web Toolkit and OpenRules

Step-by-Step Instructions
Part-1    Part-2

Introduction

This is a step-by-step account of how to develop a web application from scratch using Google Web Toolkit (GWT) and OpenRules. We will implement an application that will greet a customer based on his/her personal data and time of the day. We will create a simple GWT-based GUI to enter a customer personal data and generate a greeting. For example, at 2:20PM for a customer "Robinson" who is a married woman of 28, we want our server to generate a greeting like "Good Afternoon, Mrs. Robinson!".  At the same time, we want to implement this application in such a way that it can be easily extended to cover a much more complicated business logic with multiple business objects.

First, we will setup a development environment for a trivial GWT application. Then, we will add GWT GUI and Java classes to implement a "Hello Customer" web application. The GWT application will run in both hosted mode and in web mode. Then, we will move business logic to a remote service on the server site and finally will demonstrate how to implement more complex business logic using OpenRules decision tables incorporated in our GWT application.

Part 1 – Implementing "HelloCustomer" Application using GWT only

Part 2 – Using OpenRules to Externalize Business Logic from a GWT Application

Prerequisites

Source Code

The code and ready to run examples for Part-1 and Part-2 could be found in the standard OpenRules-5 installation - see Eclipse projects HelloGWT and HelloGWTOpenRules.

 

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