Apache Karaf might be a bit more popular than Qumulo. We know about 1 link to it since March 2021 and only 1 link to Qumulo. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I also hear good things about https://qumulo.com/, but I get the feeling that the team isn't large enough to need something like that. Source: about 2 years ago
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 3 years ago
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