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testDS1-ds.xml:

<?xml version="1.0" encoding="UTF-8"?>
<datasources>
    <local-tx-datasource>
    <jndi-name>jdbc/testDS1</jndi-name>
    <connection-url>jdbc:mysql://localhost:3306/jbpm</connection-url>
    <!--connection-url>jdbc:h2:mem:mydb</connection-url-->
    <driver-class>com.mysql.jdbc.Driver</driver-class>
    <user-name>root</user-name>
    <password></password>
    </local-tx-datasource>
</datasources>

persistence.xml in jbpm-gwt-console-server-war/WEB-INF/classes/META-INF and  jbpm-installer/db:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence version="1.0"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
                                 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
                                 http://java.sun.com/xml/ns/persistence/orm
                                 http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
             xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns="http://java.sun.com/xml/ns/persistence">

  <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>java:jdbc/testDS1</jta-data-source>      
    <mapping-file>META-INF/JBPMorm.xml</mapping-file>
    <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
    <class>org.drools.persistence.info.SessionInfo</class>
    <class>org.drools.persistence.info.WorkItemInfo</class>
     <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>        
      <property name="hibernate.max_fetch_depth" value="3"/>
      <property name="hibernate.hbm2ddl.auto" value="create" />
      <property name="hibernate.show_sql" value="false" />
      <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/jbpm" /> 
      <property name="hibernate.connection.username" value="root"/> 
      <property name="hibernate.connection.password" value=""/> 
      <property name="hibernate.connection.autocommit" value="true" /> 
      <property name="hibernate.max_fetch_depth" value="3"/> 
      <property name="hibernate.hbm2ddl.auto" value="create" /> 
      <property name="hibernate.show_sql" value="false" /> 
    </properties>       
  </persistence-unit>
   
</persistence>

persistance.xml in jbpm-gwt-console-server.war/lib/jbpm-human-task-5.1.0.Final.jar ,and in runtime/lib/jbpm-human-task-5.1.0.Final.jar:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence version="1.0"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
                                 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
                                 http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
             xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns="http://java.sun.com/xml/ns/persistence">
  <persistence-unit name="org.jbpm.task">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>org.jbpm.task.Attachment</class>
    <class>org.jbpm.task.Content</class>
    <class>org.jbpm.task.BooleanExpression</class>
    <class>org.jbpm.task.Comment</class>
    <class>org.jbpm.task.Deadline</class>
    <class>org.jbpm.task.Comment</class>
    <class>org.jbpm.task.Deadline</class>
    <class>org.jbpm.task.Delegation</class>
    <class>org.jbpm.task.Escalation</class>
    <class>org.jbpm.task.Group</class>
    <class>org.jbpm.task.I18NText</class>
    <class>org.jbpm.task.Notification</class>
    <class>org.jbpm.task.EmailNotification</class>
    <class>org.jbpm.task.EmailNotificationHeader</class>
    <class>org.jbpm.task.PeopleAssignments</class>
    <class>org.jbpm.task.Reassignment</class>
    <class>org.jbpm.task.Status</class>
    <class>org.jbpm.task.Task</class>
    <class>org.jbpm.task.TaskData</class>
    <class>org.jbpm.task.SubTasksStrategy</class>
    <class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class>
    <class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class>
    <class>org.jbpm.task.User</class>
     <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
      <property name="hibernate.max_fetch_depth" value="3"/>
      <property name="hibernate.hbm2ddl.auto" value="create" />
      <property name="hibernate.show_sql" value="false" />
      <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/jbpm" />
      <property name="hibernate.connection.username" value="root"/>
      <property name="hibernate.connection.password" value=""/>
      <property name="hibernate.connection.autocommit" value="true" />
      <property name="hibernate.max_fetch_depth" value="3"/>
      <property name="hibernate.hbm2ddl.auto" value="create" />
      <property name="hibernate.show_sql" value="false" />
    </properties>
  </persistence-unit>
</persistence>