The core engines (Drools, jBPM, Optaplanner) all are based on kjar,
that itself is a `jar` with some extra bits to have the knowledge
artifacts (business process, business rules, etc). The whole
distribution architecture of jar/kjar of our core engines rely on
Maven and requires maven infrastructure (ie. pom.xml for projects,
settings.xml for environment config and Nexus proxy for maven
central). Business Central is no different, so it requires external
maven central access or a local proxy of it.
With that said, in order to improve the getting started (it's not a
production environment recommendation) we introduce an `offline`
environment variable flag, that you can use BC offline:
kie.maven.offline.force=true
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