What is the purpose of the following code snippet in Hibernate?
Файл org.hibernate.boot.MetadataSources в формате jar можно найти в официальном репозитории Maven или в репозитории "Central" по адресу https://mvnrepository.com/. The purpose of the following code snippet in Hibernate is to create and configure a MetadataSources object, which is used to build the Hibernate metadata and mapping information. This object is responsible for loading and managing the mapping resources (XML or annotated classes) that define the configuration of the persistence model.
Подключайте зависимости Hibernate из проекта, указанного здесь: https://mvnrepository.com/search?q=hibernate, пока не будет достигнуто удовлетворение зависимости.