java - JBPM 6.2 Audit Log can't establish JTA Transaction -

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when getting process instance variables audit log, following error:

caused by: java.lang.illegalstateexception: unable find jta transaction.     @ org.jbpm.process.audit.strategy.standalonejtastrategy.jointransaction(standalonejtastrategy.java:45) [jbpm-audit.jar:6.2.0.final]     @ org.jbpm.process.audit.jpaauditlogservice.jointransaction(jpaauditlogservice.java:370) [jbpm-audit.jar:6.2.0.final]     @ org.jbpm.process.audit.jpaauditlogservice.executequery(jpaauditlogservice.java:378) [jbpm-audit.jar:6.2.0.final]     @ org.jbpm.process.audit.jpaauditlogservice.findvariableinstances(jpaauditlogservice.java:275) [jbpm-audit.jar:6.2.0.final]     @ za.co.symbiotics.jbpm.runtime.processmanager.getprocessinstancevariables(processmanager.java:53) [process-service-ejb.jar:]

any assistance appreciated. per previous question, have verified transaction-type="jta" in persistence.xml

code snippet:

list<?> variablelist = processfactory.getauditservice().findvariableinstances(processinstanceid);      public auditservice getauditservice() {          runtimeengine runtime = runtimemanager.getruntimeengine(emptycontext.get());         return runtime.getauditservice();     }  persistence.xml:      <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="jta">         <provider>org.hibernate.jpa.hibernatepersistenceprovider</provider>         <jta-data-source>java:jboss/datasources/jbpm-ds</jta-data-source>         <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/servicesorm.xml</mapping-file>          <class>org.drools.persistence.info.sessioninfo</class>         <class>org.drools.persistence.info.workiteminfo</class>          <class>org.jbpm.persistence.processinstance.processinstanceinfo</class>          <class>org.jbpm.persistence.correlation.correlationkeyinfo</class>         <class>org.jbpm.persistence.correlation.correlationpropertyinfo</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.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.audittaskimpl</class>         <class>org.jbpm.services.task.audit.impl.model.bamtasksummaryimpl</class>         <class>org.jbpm.services.task.audit.impl.model.taskeventimpl</class>          <class>org.jbpm.kie.services.impl.store.deploymentstoreentry</class>          <exclude-unlisted-classes>true</exclude-unlisted-classes>          <properties>             <property name="hibernate.max_fetch_depth" value="3" />             <property name="hibernate.show_sql" value="false" />             <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.jbosstransactionmanagerlookup" />             <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.jbossappserverjtaplatform" />             <property name="hibernate.dialect" value="org.hibernate.dialect.postgresqldialect" />             <property name="hibernate.id.new_generator_mappings" value="false" />             <property name="hibernate.hbm2ddl.auto" value="update" />         </properties>     </persistence-unit>

wildfly 8.2.0 datasource definition:

            <datasource jta="true" jndi-name="java:jboss/datasources/jbpm-ds" pool-name="bpm-ds" enabled="true" use-java-context="true" use-ccm="false">                 <connection-url>jdbc:postgresql://localhost:5432/bpm</connection-url>                 <driver>postgresql</driver>                 <pool>                     <min-pool-size>2</min-pool-size>                     <max-pool-size>20</max-pool-size>                 </pool>                 <security>                     <user-name>userid</user-name>                     <password>password</password>                 </security>                 <validation>                     <validate-on-match>false</validate-on-match>                     <background-validation>false</background-validation>                     <background-validation-millis>1</background-validation-millis>                 </validation>                 <statement>                     <prepared-statement-cache-size>0</prepared-statement-cache-size>                     <share-prepared-statements>false</share-prepared-statements>                 </statement>             </datasource>


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