Java Reference
In-Depth Information
Adding persistence to our application
In order to persist data, JPA needs a relational database; we will use the PostgreSQL data-
base, which is pretty popular among developers and can be downloaded for free from
ht-
tp://www.postgresql.org/download/
.
It is recommended to download the latest stable re-
lease of PostgreSQL 9.x and install it using the simple installation wizard. If you don't need
a full-blown database, then keep in mind that later we will also show you how to use an in-
memory database provided by WildFly, which can be a really useful alternative during de-
velopment.
