THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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OpenTrader is a sample web application to demonstrate integration of Google Web Toolkit (GWT) , and OpenJPA running in Tomcat Servlet Container. These pages describe various aspects of this end-to-end application. The following sections are fairly independent of each other and can be followed as such based on your interest.
- Architecture and core design goals
- The computing environment requirement
- Developing a GWT Client
- Developing a JPA based Server
- Communication between the components
- Building the application
- Deploying the application
GWT takes a position that is a significantly unique among the multitude of frameworks available to build a browser based client. GWT framework is based on several key concepts:
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OpenTrader - the sample example described in these pages - demonstrates how to develop a GWT client for a transactional, server application based on Java Persistence API (JPA). This example is somewhat more involved than a typical AddressBook example in terms of the complexity of the domain model, the transactional functions of the server as well as the interaction between multiple widgets in the client. Also the sample application covers a realistic use case where the core server application is defined independent of both GWT and JPA – and then demonstrates how these two technologies are used to implement an end-to-end service running inside a Tomcat Servlet Container. Architecture
Client-side development Server-side development
Client-Server communication
Deployment
Follow the steps to view OpenTrader source code, build the application, deploy it in your favorite application container and run it in your favorite browser.
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OpenTrader source code is available as one of the OpenJPA examples. Checkout the source files in a directory.
$ svn checkout https://svn.apache.org/repos/asf/openjpa/trunk/openjpa-examples/opentrader
The source tree comes with
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This should again take a very long time and pop open a horrible looking Swing console titled GWT Development Mode. Go to Development Mode tab and click Launch Default Browser. On my FireFox browser, that opens up the page http://127.0.0.1:8888/OpenTrader.html?gwt.codesvr=127.0.0.1:9997. If all goes well, at this point your browser will prompt you with a welcome dialog box
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