Jpa is a java framework to manage relational database records as plain java objects.

It can be confirured (if you are using [[maven]] and spring boot) in the pom file, with the following dependencies:

  <dependency>
  	<groupId>org.springframework.boot</groupId>
  	<artifactId>spring-boot-starter-data-jpa</artifactId>
  </dependency>

And you will need to specify a database, for example:

  <dependency>
  	<groupId>mysql</groupId>
  	<artifactId>mysql-connector-java</artifactId>
  	<scope>runtime</scope>
  </dependency>

Or

  <dependency>
  	<groupId>com.h2database</groupId>
  	<artifactId>h2</artifactId>
  	<scope>runtime</scope>
  </dependency>

In addition, you have to configure some properties, that can be done in the properties file or by java code. In the property file would be:

  # JPA (JpaBaseConfiguration, HibernateJpaAutoConfiguration)
  #spring.jpa.properties.hibernate.default_schema=sql7351295
  spring.jpa.properties.hibernate.format_sql=true
  spring.jpa.properties.hibernate.generate_statistics=true
  #to generate the tables, fields and other ddl structures if they are not present
  spring.jpa.hibernate.ddl-auto=update
  #to transform the hql queries in sql to be seen in the logfile
  spring.jpa.show-sql=true

  #to use a h2 in memmory embedded database
  spring.datasource.url=jdbc:h2:mem:testdb
  #to use a h2 file database
  #spring.datasource.url=jdbc:h2:file:/data/demo
  spring.datasource.driverClassName=org.h2.Driver
  spring.datasource.username=sa
  spring.datasource.password=password
  spring.jpa.database-platform=org.hibernate.dialect.H2Dialect