Modular architecture
Apache Karaf features a highly modular architecture that allows users to deploy, control, and monitor applications in a flexible and efficient manner. This makes it easy to manage dependencies and extend functionalities as needed.
OSGi support
Karaf fully supports OSGi (Open Services Gateway initiative), which is a framework for developing and deploying modular software programs and libraries. This enables dynamic updates and replacement of modules without requiring a system restart.
Extensible and flexible
Karaf's extensible architecture allows developers to integrate various technologies and custom modules, fostering a flexible environment that can suit a wide range of application types and requirements.
Enterprise features
It provides a range of enterprise-ready features such as hot deployment, dynamic configuration, clustering, and high availability, which can help in building robust and scalable applications.
Comprehensive tooling
Karaf comes with comprehensive tooling support including a powerful CLI, web console, and various tools for monitoring and managing the runtime environment. These tools simplify everyday management tasks.
Apache Karaf with OSGi works pretty nice using annotation based dependency injection with the declarative services, removing the need to mess with those hopefully archaic XML blueprints. Too bad it's not as trendy as spring and the developers so many of the tutorials can be a bit dated and hard to find. Karaf also supports many other frameworks and programming models as well and there's even Red Hat supported... Source: about 4 years ago
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