April 2018
Intermediate to advanced
202 pages
4h 48m
English
Content preview from Data-Centric Applications with Vaadin 8
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Creating an EntityManagerFactory
We have defined a connection through a persistence unit, but the application is not actually using it yet. The way applications make use of JPA is through the EntityManagerFactory. You can think of the EntityManagerFactory as the entry point to JPA. An EntityManagerFactory allows you to interact with a specific persistence unit. It's almost, but not precisely, like the connection pool, if you like.
JPA implementations, like Hibernate or EclipseLink, offer built-in connection pooling mechanisms which are handled internally. You can usually adjust the pool configuration by using additional properties in the persistence unit definition. Consult the documentation of the JPA implementation you use for more details. ...
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