generator-jangular/app/templates/src/main/resources/META-INF/persistence.xml

Quickstart a Maven + CDI + TomEE + Jackson + AngularJS project

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
        http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
	version="1.0">

	<!-- A JPA Persistence Unit -->
	<persistence-unit name="<%= _.camelize(baseName) %>JpaUnit">
        <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>

        <!-- JPA entities must be registered here -->
		<class><%= packageName %>.entity.User</class>

		<properties>
			<property name="javax.persistence.jdbc.url" value="jdbc:hsqldb:mem:demo" /> 
            <property name="javax.persistence.jdbc.driver" value="org.hsqldb.jdbcDriver" />
            <property name="javax.persistence.jdbc.user" value="" />
            <property name="javax.persistence.jdbc.password" value="" />

            <property name="openjpa.jdbc.SynchronizeMappings"   value="buildSchema(ForeignKeys=true)"/>
            <property name="openjpa.jdbc.DBDictionary" value="org.apache.openjpa.jdbc.sql.HSQLDictionary"/>
            <property name="openjpa.Log" value="DefaultLevel=WARN, Runtime=INFO, Tool=INFO, SQL=TRACE"/>
		</properties>
	</persistence-unit>

</persistence>