OSGi (Open Services Gateway Initiative) is a Java-based framework for developing and deploying modular applications. It defines a dynamic component system in which applications are composed of reusable modules called bundles. These bundles can be installed, started, stopped, updated, and uninstalled at runtime without restarting the entire application.
Key Features of OSGi :
- Modularity – Applications are divided into independent modules (bundles), promoting reuse and maintainability.
- Lifecycle Management – Bundles have a defined lifecycle (install, start, stop, update, uninstall).
- Service Registry – Bundles can dynamically register, discover, and use services at runtime.
- Versioning – Different versions of the same bundle can coexist, preventing dependency conflicts.
- Dynamic Loading – Bundles can be loaded and unloaded dynamically without restarting the JVM.
Where is OSGi Used?
- Enterprise Applications – Helps build modular Java EE applications.
- Embedded Systems – Used in IoT, automotive, and home automation.
- Eclipse IDE – The Eclipse platform is based on OSGi.
- Application Servers – Many Java EE servers (like Apache Karaf, GlassFish) use OSGi.
