spring-boot-rest/persistence-modules/java-jpa/src/main/resources/META-INF/persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
             http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd"
	version="2.2">

	<persistence-unit name="java-jpa-scheduled-day">
		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
		<class>com.baeldung.jpa.sqlresultsetmapping.ScheduledDay</class>
		<class>com.baeldung.jpa.sqlresultsetmapping.Employee</class>
		<class>com.baeldung.jpa.basicannotation.Course</class>
		<exclude-unlisted-classes>true</exclude-unlisted-classes>
		<properties>
			<property name="javax.persistence.jdbc.driver"
				value="org.h2.Driver" />
			<property name="javax.persistence.jdbc.url"
				value="jdbc:h2:mem:test;MODE=LEGACY;INIT=RUNSCRIPT FROM 'classpath:database.sql'" />
			<property name="javax.persistence.jdbc.user" value="sa" />
			<property name="javax.persistence.jdbc.password" value="" />
			<property name="hibernate.dialect"
				value="org.hibernate.dialect.H2Dialect" />
			<!--<property name="hibernate.hbm2ddl.auto" value="create-drop" /> -->
			<property name="show_sql" value="true" />
			<property name="hibernate.temp.use_jdbc_metadata_defaults"
				value="false" />
		</properties>
	</persistence-unit>

	<persistence-unit name="jpa-h2">
		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
		<class>com.baeldung.jpa.stringcast.Message</class>
		<class>com.baeldung.jpa.enums.Article</class>
		<class>com.baeldung.jpa.enums.CategoryConverter</class>
		<exclude-unlisted-classes>true</exclude-unlisted-classes>
		<properties>
			<property name="javax.persistence.jdbc.driver"
				value="org.h2.Driver" />
			<property name="javax.persistence.jdbc.url"
				value="jdbc:h2:mem:test;MODE=LEGACY" />
			<property name="javax.persistence.jdbc.user" value="sa" />
			<property name="javax.persistence.jdbc.password" value="" />
			<property name="hibernate.dialect"
				value="org.hibernate.dialect.H2Dialect" />
			<property name="hibernate.hbm2ddl.auto" value="create-drop" />
			<property name="show_sql" value="true" />
			<property name="hibernate.temp.use_jdbc_metadata_defaults"
				value="false" />
		</properties>
	</persistence-unit>

	<persistence-unit name="jpa-db">
		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
		<class>com.baeldung.jpa.model.Car</class>
		<exclude-unlisted-classes>true</exclude-unlisted-classes>
		<properties>
			<property name="javax.persistence.jdbc.driver"
				value="com.mysql.jdbc.Driver" />
			<property name="javax.persistence.jdbc.url"
				value="jdbc:mysql://127.0.0.1:3306/baeldung" />
			<property name="javax.persistence.jdbc.user"
				value="baeldung" />
			<property name="javax.persistence.jdbc.password"
				value="YourPassword" />
			<property name="hibernate.dialect"
				value="org.hibernate.dialect.MySQLDialect" />
			<property name="hibernate.show_sql" value="true" />
		</properties>
	</persistence-unit>

	<persistence-unit name="entity-graph-pu"
		transaction-type="RESOURCE_LOCAL">
		<class>com.baeldung.jpa.entitygraph.model.Post</class>
		<class>com.baeldung.jpa.entitygraph.model.User</class>
		<class>com.baeldung.jpa.entitygraph.model.Comment</class>
		<exclude-unlisted-classes>true</exclude-unlisted-classes>
		<properties>

			<!--H2 -->
			<property name="javax.persistence.jdbc.driver"
				value="org.h2.Driver" />
			<property name="javax.persistence.jdbc.url"
				value="jdbc:h2:mem:entitygraphdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE;NON_KEYWORDS=USER" />

			<property
				name="javax.persistence.schema-generation.database.action"
				value="drop-and-create" />
			<property name="javax.persistence.sql-load-script-source"
				value="data-init.sql" />
		</properties>
	</persistence-unit>

	<persistence-unit name="java8-datetime-postgresql"
		transaction-type="RESOURCE_LOCAL">
		<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
		<class>com.baeldung.jpa.datetime.JPA22DateTimeEntity</class>
		<exclude-unlisted-classes>true</exclude-unlisted-classes>
		<properties>
			<property name="javax.persistence.jdbc.driver"
				value="org.postgresql.Driver" />
			<property name="javax.persistence.jdbc.url"
				value="jdbc:postgresql://localhost:5432/java8-datetime2" />
			<property name="javax.persistence.jdbc.user"
				value="postgres" />
			<property name="javax.persistence.jdbc.password"
				value="postgres" />
			<property
				name="javax.persistence.schema-generation.database.action"
				value="drop-and-create" />

			<!-- configure logging -->
			<property name="eclipselink.logging.level" value="INFO" />
			<property name="eclipselink.logging.level.sql" value="FINE" />
			<property name="eclipselink.logging.parameters" value="true" />
		</properties>
	</persistence-unit>

	<persistence-unit name="jpa-entity-definition">
		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
		<class>com.baeldung.jpa.entity.Student</class>
		<class>com.baeldung.jpa.primarykeys.Book</class>
		<class>com.baeldung.jpa.primarykeys.BookId</class>
		<class>com.baeldung.jpa.primarykeys.Account</class>
		<class>com.baeldung.jpa.primarykeys.AccountId</class>
		<exclude-unlisted-classes>true</exclude-unlisted-classes>
		<properties>
			<property name="javax.persistence.jdbc.driver"
				value="org.h2.Driver" />
			<property name="javax.persistence.jdbc.url"
				value="jdbc:h2:mem:test" />
			<property name="javax.persistence.jdbc.user" value="sa" />
			<property name="javax.persistence.jdbc.password" value="" />
			<property name="hibernate.dialect"
				value="org.hibernate.dialect.H2Dialect" />
			<property name="hibernate.hbm2ddl.auto" value="create-drop" />
			<property name="show_sql" value="true" />
			<property name="hibernate.temp.use_jdbc_metadata_defaults"
				value="false" />
		</properties>
	</persistence-unit>

</persistence>