如果基于Java的应用程序需要添加或删除模块(扩展应用程序的基本功能)，而不需要关闭JVM，则可以使用OSGI。通常，如果关闭JVM的成本比较高，那么仅仅是为了更新或增强功能。

例子:

Eclipse:为插件的安装、卸载、更新和相互依赖提供了平台。 AEM: WCM应用程序，其中功能更改将由业务驱动，无法承担维护停机时间。

注意:Spring框架停止支持OSGI Spring包，认为它对于基于事务的应用程序或这些行中的某些点来说是不必要的复杂性。我个人是不会考虑OSGI的，除非绝对必要，比如在构建平台这样的大项目中。

You can, analogically speaking, change the motor of your car without turning it off. You can customize complex systems for the customers. See the power of Eclipse. You can reuse entire components. Better than just objects. You use a stable platform to develop component based Applications. The benefits of this are huge. You can build Components with the black box concept. Other components don't need to know about hidden interfaces, them see just the published interfaces. You can use in the same system several equal components, but in different releases, without compromise the application. OSGi solves the Jar Hell problem. With OSGi you develop thinking to architect systems with CBD

对于使用Java的每个人来说，有很多好处(我现在只提醒了这些)。

I don't care too much about the hotplugability of OSGi modules (at least currently). It's more the enforced modularity. Not having millions of "public" classes available on the classpath at any time protects well from circular dependencies: You have to really think about your public interfaces - not just in terms of the java language construct "public", but in terms of your library/module: What (exactly) are the components, that you want to make available for others? What (exactly) are the interfaces (of other modules) you really need to implement your functionality?

这很好，热插拔是附带的，但我宁愿重新启动我通常的应用程序，而不是测试所有的热插拔组合…

我还不是OSGi的“粉丝”…

我一直在财富100强公司使用企业应用程序。最近，我们使用的产品已经“升级”为OSGi实现。

启动本地cba部署… [2/18/14 8:47:23 727 EST] 00000347 CheckForOasis

最终部署，“以下包将暂停，然后重新启动” 00000143 AriesApplicat I CWSAI0054I:作为应用程序更新操作的一部分

51分钟……每次代码改变…以前的版本(非osgi)在旧的开发机器上部署不到5分钟。

在一台有16g内存和40g空闲磁盘和Intel i5-3437U 1.9 GHz CPU的机器上

The "benefit" of this upgrade was sold as improving (production) deployments - an activity that we do about 4 times a year with maybe 2-4 small fix deployments a year. Adding 45 minutes per day to 15 people (QA and developers) I can't imagine ever being justified. In big enterprise applications, if your application is a core application, then changing it is, rightly so (small changes have potential for far reaching impacts - must be communicated and planned with consumers all over the enterprise), a monumental activity - wrong architecture for OSGi. If your application is not an enterprise application - i.e. each consumer can have their own tailored module likely hitting their own silo of data in their own silo'd database and running on a server that hosts many applications, then maybe look at OSGi. At least, that is my experience thus far.

它还被用于在移动端带来额外的中间件和应用程序的可移植性。移动端可用于WinMo, Symbian, Android等。一旦与设备功能集成，就会出现碎片化。

我发现OSGi有以下好处:

每个插件都是一个版本化的工件，它有自己的类加载器。 每个插件都依赖于它所包含的特定jar和其他特定版本的插件。 由于版本控制和隔离的类加载器，同一工件的不同版本可以同时加载。如果应用程序的一个组件依赖于插件的一个版本，而另一个组件依赖于另一个版本，那么它们可以同时加载。

这样，您就可以将应用程序构建为一组按需加载的版本化插件构件。每个插件都是一个独立的组件。就像Maven帮助您构建构建，使其可重复，并由创建它的工件的一组特定版本定义一样，OSGi帮助您在运行时完成这一点。