Sample JPA 2.1 persistence units

persistence.xml

<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_1.xsd"
  version="2.1">

  <!-- Hibernate + H2 -->
  <persistence-unit name="standalonePu" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <class>com.acme.MyEntity</class>
    <properties>
      <property name="javax.persistence.jdbc.driver" value="org.h2.Driver" />
      <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:dbname;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE" />
      <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
    </properties>
  </persistence-unit>
  
  <!-- Hibernate + Derby -->
  <persistence-unit name="standalonePu" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <class>com.acme.MyEntity</class>
    <properties>
      <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
      <property name="javax.persistence.jdbc.url" value="jdbc:derby:memory:dbname;create=true" />
      
      <property name="hibernate.dialect" value="org.hibernate.dialect.DerbyDialect" />
      <property name="hibernate.hbm2ddl.auto" value="create" />
      <property name="hibernate.show_sql" value="true" />
      <property name="hibernate.format_sql" value="true" />
    </properties>
  </persistence-unit>
  
  <!-- Hibernate (JTA) -->
  <persistence-unit name="jndiPu" transaction-type="JTA">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <jta-data-source>jdbc/MyDatasource</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
  </persistence-unit>
  
  <!-- EclipseLink + MySQL -->
  <persistence-unit name="eclipselinkPu" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>com.acme.MyEntity</class>
    <properties>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
      <property name="javax.persistence.jdbc.user" value="scott" />
      <property name="javax.persistence.jdbc.password" value="tiger" />
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/dbname" />
      
      <property name="eclipselink.logging.level" value="FINE"/>
      <property name="eclipselink.target-database" value="MySQL"/>
      <property name="eclipselink.ddl-generation" value="create-tables" />
    </properties>
  </persistence-unit>
  
  <!-- See https://docs.oracle.com/javaee/7/tutorial/persistence-intro005.htm for further information -->
</persistence>