This review is about OSGi in action from Richard Hall, Karl Pauls, Stuart McCulloch, and David Savage from Manning Publications. Facts 11 chapters, 548 pages, $49.99Covers OSGi R4.2 Pros Easy step-by-step learning approachCovers many OSGi pitfallsUse-case study included Cons Too much material 😉 Conclusion I tried once or twice to tackle OSGi on my own, without much success.

[…​] coupling (or dependency) is the degree to which each program module relies on each one of the other modules. — Wikipedia http://en.wikipedia.org/wiki/Coupling_(computer_science) In object-oriented programming, removing dependencies is done by using interface. Thus, if class A is dependent on class B, we introduce interface C, which is implemented by B. Now A depends on C  (see below). This first step in decoupling is called programming by interface.