4. In-depth look at bundles and services

This chapter covers Keeping bundle packages private to decrease exposure Making bundle packages optional to improve flexibility The wiring API Understanding class loading in a bundle Advanced use of service filtering Service prioritization Service factories Unit testing and integration testing for robustness

In chapter 3, we developed our first OSGi-based application employing two important OSGi features: bundles and services. As you’ve seen, bundles allow you to modularize your code, which lends to better reuse of code. Likewise, services improve the decoupling between the bundles, which yields a more resilient and flexible system architecture.