Shashi Velur’s blog

Here are the things every Java developer working on OSGi-based middleware must know, IMO:

Essentials:

• Design-by-Contract & SOA
• Component/Package Versioning
• OSGi Bundle Lifecycle
• Bundle Manifest directives
• Core OSGi services
• Spring DM (especially for simplification of the usage of OSGi services and writing in-container tests)
• BND tool (I cannot think of a better way to create the OSGi manifest files than this)
• Basics of classloading in OSGi

Advanced Topics:

• HTTP Server options in OSGi (OSGi HTTP Service, HTTP Servlet Bridge, etc.)
• OSGi “uses” directive and the “type leakage” problem
• OSGi Services vs. Extensions/Extension points
• Service Trackers
• Concurrency gotchas in OSGi
• The Whiteboard pattern
• The “Extender bundle pattern”
• OSGi Declarative Services and Configuration Admin Service

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