See this page for an example of an up to date "persistence.xml" that uses JTA/Bitronix:
https://github.com/kiegroup/jbpm/blob/master/jbpm-examples/src/main/resources/META-INF/persistence.xml

<?xml version="1.0" encoding="UTF-8"?> <persistence 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" version="2.1"> <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider> <mapping-file>META-INF/JBPMorm.xml</mapping-file> <mapping-file>META-INF/Taskorm.xml</mapping-file> <mapping-file>META-INF/TaskAuditorm.xml</mapping-file> <mapping-file>META-INF/JBPMCustomorm.xml</mapping-file> <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class> <class>org.drools.persistence.info.SessionInfo</class> <class>org.drools.persistence.info.WorkItemInfo</class> <class>org.jbpm.process.audit.ProcessInstanceLog</class> <class>org.jbpm.process.audit.NodeInstanceLog</class> <class>org.jbpm.process.audit.VariableInstanceLog</class> <class>org.jbpm.persistence.correlation.CorrelationKeyInfo</class> <class>org.jbpm.persistence.correlation.CorrelationPropertyInfo</class> <class>org.jbpm.runtime.manager.impl.jpa.ContextMappingInfo</class> <class>org.jbpm.services.task.impl.model.AttachmentImpl</class> <class>org.jbpm.services.task.impl.model.ContentImpl</class> <class>org.jbpm.services.task.impl.model.BooleanExpressionImpl</class> <class>org.jbpm.services.task.impl.model.CommentImpl</class> <class>org.jbpm.services.task.impl.model.DeadlineImpl</class> <class>org.jbpm.services.task.impl.model.DelegationImpl</class> <class>org.jbpm.services.task.impl.model.EscalationImpl</class> <class>org.jbpm.services.task.impl.model.GroupImpl</class> <class>org.jbpm.services.task.impl.model.I18NTextImpl</class> <class>org.jbpm.services.task.impl.model.NotificationImpl</class> <class>org.jbpm.services.task.impl.model.EmailNotificationImpl</class> <class>org.jbpm.services.task.impl.model.EmailNotificationHeaderImpl</class> <class>org.jbpm.services.task.impl.model.PeopleAssignmentsImpl</class> <class>org.jbpm.services.task.impl.model.ReassignmentImpl</class> <class>org.jbpm.services.task.impl.model.TaskImpl</class> <class>org.jbpm.services.task.impl.model.TaskDataImpl</class> <class>org.jbpm.services.task.impl.model.UserImpl</class> <class>org.jbpm.services.task.audit.impl.model.BAMTaskSummaryImpl</class> <class>org.jbpm.services.task.audit.impl.model.TaskEventImpl</class> <class>org.jbpm.services.task.audit.impl.model.AuditTaskImpl</class> <class>org.jbpm.services.task.audit.impl.model.TaskVariableImpl</class> </persistence-unit> </persistence>