One of the most common complaints about OSGi is that it can increase complexity for a developer. There is a grain of truth here, but people who make this complaint are mistaking the medicine for the disease.
Modularity is not a magic dust that can be sprinkled onto an application just before release. It is a discipline that must be followed throughout all phases of design and development. Developers who adopt OSGi early and apply modular thinking before writing a line of code realise enormous gains[...]
Project Jigsaw started with a goal of being simple, but the JPMS specification has increased enormously in complexity: the interplay of modules with class loaders; hierarchical layers and configurations; re-exporting requirements; weak modules; static requirements; qualified exports; dynamic exports; inherited readability across layers; multi-module JARs; automatic modules; unnamed modules… all these features have been added as the need for them became clear. A similar process happened in OSGi, just with a 16-year head start.The article is well written and provides a clear understanding of the differences between OSGi and JPMS as it stands today. Looking forward to part 2.