Hello,
I encountered a problem like yours.
After looking at other post I make these changes :
in persistent.xml :
<class>org.drools.persistence.info.SessionInfo</class>
<class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
<class>org.drools.persistence.info.WorkItemInfo</class>
And the POM, I add the dependency for drools 5.5 :
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>5.5.0.Final</version>
</dependency>
Regards,