Hier ist my Persistence.xml:

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

<persistence version="2.0"
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_2_0.xsd">

<persistence-unit name="XXX" transaction-type="JTA">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<jta-data-source>jdbc/XXX</jta-data-source>
<class>XXX</class>
<properties>
<property name="hibernate.transaction.jta.platform" value="org.hibernate.engine.transaction.jta.platform.internal.WebSphereExtendedJtaPlatform"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.DB2390Dialect"/>
<property name="javax.persistence.lock.timeout" value="5000"/>
<property name="hibernate.show_sql" value="false"/>
<property name="hibernate.use_sql_comments" value="false"/>
<property name="transaction.manager_lookup_class" value="org.hibernate.transaction.WebSphereTransactionManagerLookup"/>
<property name="transaction.flush_before_completion" value="true"/>
<property name="current_session_context_class" value="jta"/>
<property name="hibernate.transaction.coordinator_class" value="jta"/>

</properties>
</persistence-unit>
</persistence>

Maven dependency:

<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.3.1.Final</version>
<exclusions>
<exclusion>
<artifactId>jboss-transaction-api_1.2_spec-1.0.0.Final</artifactId>
<groupId>org.jboss.spec.javax.transaction</groupId>
</exclusion>
</exclusions>
</dependency>