Traditional Jakarta EE implementations are application servers; which are software products mostly intended to be installed. They have the ability to deploy and undeploy one or more applications on them, and typically contain support for monitoring, clustering and many additional features. GlassFish is one example of such implementation.
Eclipse Piranha Cloud intends to provide an implementation of Jakarta EE without being an application server. It focuses on being highly composable, both in regards to the Jakarta EE implementation components being used, as with regard to some of the features that are provided.
A special focus is on embedded use, where a runtime composition can be used that commits functionality not necessarily used for embedded use. E.g. Eclipse Piranha Cloud could be used to just render a Jakarta Faces page into a String, so such composition would not need an HTTP server. The code embedding such Eclipse Piranha Cloud instance would only include the Mojarra lib and the embedding code would programmatically create and pass an object representing an HTTPServletRequest in.
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