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JAVA TECHNOLOGY FOR THE WIRELESS INDUSTRY

机译：适用于无线行业的Java技术

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The Java Technology for the Wireless Industry specification (JTWI) encompasses a standard set of J2ME APIs for mobile device development that is being widely adopted by mobile telephone service providers, making it an important platform for Java developers. Its core component, the Mobile Information Device Profile (MIDP), provides a number of specialized libraries for multimedia and games development; however, its underlying subset of general purpose Java classes is strictly limited. In addition, support for persistence via the Record Management System is relatively poor. This raises an important question: Is JTWI a realistic application development tool or is it only good for games and other software trivia? In this article, we try to answer this question by exploring the viability of MIDP as a tool for nontrivial applica- . tion development. An enterprise application that includes mobile components might reasonably expect to devolve some of its business processes and data management to mobile devices. Our chosen example, which considers both of these aspects, is a proposed implementation of the Java Data Objects (JDO) specification. This includes a number of interesting features that highlight the constraints of working with J2ME APIs for limited devices. We describe the issues around the development of such an implementation and the limitations that MIDP imposes, suggest some useful workarounds and architectural options, and finally draw some conclusions about the usefulness of JTWI as a set of APIs for serious application development.
机译：无线行业Java技术规范（JTWI）包含了一组用于移动设备开发的标准J2ME API，移动电话服务提供商已广泛采用了这套标准，使其成为Java开发人员的重要平台。它的核心组件，移动信息设备配置文件（MIDP），提供了许多用于多媒体和游戏开发的专用库。但是，它的通用Java类的基础子集受到严格限制。另外，通过记录管理系统对持久性的支持相对较差。这就提出了一个重要的问题：JTWI是一种现实的应用程序开发工具，还是仅对游戏和其他软件琐事有用？在本文中，我们试图通过探索MIDP作为非平凡应用工具的可行性来回答这个问题。 tion开发。包含移动组件的企业应用程序可能会合理地期望将其某些业务流程和数据管理移交给移动设备。我们选择的同时考虑了这两个方面的示例是Java数据对象（JDO）规范的建议实现。这包括许多有趣的功能，这些功能突出了在受限设备上使用J2ME API的限制。我们描述了围绕这种实现的开发所遇到的问题以及MIDP施加的限制，提出了一些有用的解决方法和体系结构选择，最后得出了一些有关JTWI作为一组用于认真的应用程序开发的API的有用性的结论。

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