Practical OSGi

The document discusses the OSGi framework, which defines a module system and service platform for Java that allows modules known as bundles to be dynamically installed, started, stopped, updated, and uninstalled. It provides an overview of key OSGi concepts like modules, services, and lifecycles. It also demonstrates how to create an example application with bundles that export and import packages, register and use services, and handle bundle lifecycles at runtime.