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It is doable, and some contrib extension do it already, but it has serious limitations:

extension can force a reload of Hibernate, but it does not always work (and never in case of HSQLDB), so any install of the extension (or upgrade to a version impacting the mapping) usually require a restart
if you manipulate any Hibernate API which return instance of the class defined in the mapping (like queries directly returning entities), any upgrade/uninstall of any extension on the same namespace require a restart (because of the classloader reload)

blocks

XWIKI-19933 Move the old event store to the attic

depends on

XWIKI-19385 Hibernate store reload still does not work on HSQLDB

is duplicated by

XWIKI-8271 Add support for Platform Modules and more generally Extensions to provide new Hibernate mappings

is related to

XWIKI-19303 Make easier to inject hibernate mapping from an extension

relates to

XWIKI-18877 Classcastexception when requesting database object from an upgraded extension