1. A system, comprising: a computer processor; a memory coupled to the processor and storing program instructions executable by the processor to implement a hybrid application server, wherein the hybrid application server comprises: an application server container that provides runtime support, for components deployed on the application server container, to access a system-level resource; a dynamic module container that provides dynamic deployment and discovery support for clients of the dynamic module container separate from the application server container; and a resources-exporter module deployed on the dynamic module container and configured to: detect that a system-level resource of the application server container has been deployed; and in response to detecting that the system-level resource of the application server container has been deployed, register a proxy object for the system-level resource as a service in the dynamic module container , wherein the registered proxy object provides a handle for clients of the dynamic module container to invoke the system-level resource of the application server container.