The product has a great interactive GUI. You will seldom have to use the command line and can perform most of the administrative activities using the GUI tool itself. You can configure it to support clustering and standalone environments. It can be deployed on-premise and cloud. It's modular structure makes it very convenient to administer.
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It's quite easy to learn and use. We have transitioned our Red Hat JBoss EAP set up to client team. They had no technical background of managing it but were quick to learn the product.
JBoss overall is easy to use. The installation and deployment of applications are quick. Documentations and support are also readily available.