Adding eclipselink.target-server to the persistence.xml file

The persistence.xml file requires the inclusion of the eclipselink.target-server property to fully enable transactional behavior. The persistence.xml file located at src/main/resources/META-INF should look like the following:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" 
  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">

  <persistence-unit name="tttPU" transaction-type="JTA">
    <provider>
        org.eclipse.persistence.jpa.PersistenceProvider
    </provider>
    <jta-data-source>jdbc/tasktimetracker</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
        <property name="eclipselink.target-server"
            value...