Editing OSGi (section)

== Architecture ==
{{Unreferenced section|date=September 2023}}
[[File:Osgi framework.svg|thumb|OSGi Service Gateway Architecture]]

OSGi is a Java framework for developing and deploying modular software programs and libraries. Each bundle is a tightly coupled, dynamically loadable collection of classes, jars, and configuration files that explicitly declare their external dependencies (if any).

The framework is conceptually divided into the following areas:
;Bundles:Bundles are normal [[JAR (file format)|JAR]] components with extra manifest headers.
;Services:The services layer connects bundles in a dynamic way by offering a publish-find-bind model for plain old Java interfaces ([[POJI]]s) or [[plain old Java object]]s (POJOs).
;Services Registry:The [[application programming interface]] for management services.
;Life-Cycle:The [[application programming interface]] for life cycle management (install, start, stop, update, and uninstall) for bundles.
;Modules:The layer that defines encapsulation and declaration of dependencies (how a bundle can import and export code).
;Security:The layer that handles the security aspects by limiting bundle functionality to pre-defined capabilities.
;Execution Environment:Defines what methods and classes are available in a specific platform. There is no fixed list of execution environments, since it is subject to change as the [[Java Community Process]] creates new versions and editions of Java. However, the following set is currently supported by most OSGi implementations:
:*[[Connected Device Configuration|CDC-1.0/Foundation-1.0]]
:*[[Connected Device Configuration|CDC-1.1/Foundation-1.1]]
:*OSGi/Minimum-1.0
:*OSGi/Minimum-1.1
:*JRE-1.1
:*From J2SE-1.2 up to J2SE-1.6