You can learn more on how the configuration of a DataSource and JNDI can be performed within the Payara Server in the Data Source with JPA video. We provide this DataSource through a JNDI entry that is created. The runtime still needs a DataSource so that the JPA implementation can do its work. JPA uses a higher abstraction level which means you don't need to interact on this detailed level with the database connection. At the lowest level, this is done using the DataSource, Connection, Statement, and ResultSet which are part of the JDBC specification. To connect to a database, we need to indicate where the database is located and what parameters are required for the connection. You can follow along with the configuration and reading of the data in this video:ДЄs always, the configuration for using this feature is limited but since we are now connecting to an external system we'll need to define a few more aspects. The specification is rather large so make sure you also consult some documentation and other resources to find out all the capabilities of the specification. In this blog, we cover some of the basic aspects of the JPA specification and how you can use it.

With the help of annotations on Java classes and instance variables, the mapping is defined between the Java world and the database world. You can use Jakarta JPA to read and write Java instances easily from and to the database. With the Jakarta Persistence API, the system can perform the serialization of Java Objects into the Database or read data into objects.

Eclipse glassfish jpa