Apache Felix is an open source implementation of the OSGi Release 5 core framework specification. The initial codebase was donated from the Oscar project at ObjectWeb. The developers worked on Felix for a full year and have made various improvements while retaining the original footprint and performance. On June 21, 2007, the project graduated from incubation as a top level project and is considered the smallest size software at Apache Software Foundation.
To run Apache Felix OSGi, you need to download the felix-framework-4.x.x.tar.gz or felix-framework-4.x.x.zipcompressed file from the site. Once you have extracted the Felix framework distribution, from the command line in the extracted directory type the following:
java -jar bin/felix.jar
After bundles are installed and running, typing a command like help from the console will display all available commands, which are:
bundlelevel <level> <id> ... | <id> - set or get bundle start level.