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="SunAS9"/>
<property name="eclipselink.logging.level"
value="INFO"/>
</properties>
</persistence-unit>
</persistence>Without this addition, transactions will not be available in your application. The eclipselink.logging.level may also be changed to increase or decrease logging output as desired.
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