Creating persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.2" 
             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">
    <persistence-unit name="greeting" transaction-type="JTA"> 
        <description>A persistence unit for the greeting example.</description>
        <jta-data-source>greetingDataSource</jta-data-source> 
        <class>io.helidon.example.jpa.Greeting</class> 
        <properties> 
            <property name="eclipselink.deploy-on-startup" value="true"/>
            <property name="eclipselink.jdbc.native-sql" value="true"/>
            <property name="eclipselink.logging.logger" value="JavaLogger"/>
            <property name="eclipselink.logging.parameters" value="true"/>
            <property name="eclipselink.target-database" value="org.eclipse.persistence.platform.database.H2Platform"/> 
            <property name="eclipselink.target-server" value="io.helidon.integrations.cdi.eclipselink.CDISEPlatform"/> 
            <property name="eclipselink.weaving" value="false"/> 
        </properties>
    </persistence-unit>
</persistence>