The java extensions framework provides a means by which you can add functionality to the java core platform , which uses the jar file for packaging of extensions . java 3d and javamail are examples of extensions developed by sun Java扩展框架( java extensions framework )提供了向java核心平台添加功能的方法，这些扩展是用jar文件打包的( java 3d和javamail就是由sun开发的扩展例子) 。
In my opinion , sun probably took this approach so that someone couldn t walk off with the javamail reference implementation that had many developers working on it transcribing public domain rfcs until the early hours of the morning and make boatloads of cash with it 我认为， sun采取这种方法的目的很可能是使其他人无法窃取javamail参考实现（曾有许多开发人员通宵达旦地将其转录到不受版权限制的rfc中）并籍此谋利。
This means that for geronimo to provide a complete package , yet another set of people is going to have to transcribe the public domain rfcs for internet mail into a working software model and then write a clean - room version of the sun javamail api to glue it all together 这也就意味着geronimo要提供一个完整的包，而其他一些人则不得不将不受版权限制的internet邮件rfc转录到有效工作的软件模型内，然后编写sun javamail api的净化版本，以将其聚集在一起。
Parts of j2ee architecture were implemented respectively by the three applications in this paper such as jsp and servlets , jdbc , jdbc pooling and javabeans in amms apparatus management system ; javamail and jaf , jms in amms web mail application ; and jndi , ejb , java security service and so on in amms dynamic web publishing system - ejb core construction 军事医学科学院仪器设备管理系统依托jsp与servlets 、 jdbc与jdbc池、 javabeans等技术规范，军事医学科学院webmail应用程序主要使用javamail与jaf 、 jms ，军事医学科学院动态web发布系统ejb内核构建则实现了jndi 、 ejb以及java安全服务等其它技术规范。
Using session beans provides the application developer access to the full range of j2ee functionality afforded by the ejb container , including jndi , declarative transaction semantics , automatic concurrency support and resource management , declarative security , and access to other enterprise resources such as entity beans , datasources , javamail , and jca adapters 通过使用会话bean ，应用开发者可以访问ejb容器所提供的整个范围的j2ee功能，包括jndi 、宣告式事务语义、自动并发支持、资源管理、宣告式安全性以及对诸如实体bean 、数据源、 javamail和jca适配器之类的企业资源的访问。
