Hi Mauricio, Thanks for your reply. When I try to run the demo project with configuration to work with Mysql, I got this exception when I uncommented the the named-query in orm.xml </query> select v from VariableInstanceInfo v where v.processInstanceInfo.id = :processId </query> SEVERE: Error in named query: VariableInstancesInfoByProcessId org.hibernate.QueryException: could not resolve property: processInstanceInfo of: org.drools.persistence.processinstance.variabletypes.VariableInstanceInfo [select v from org.drools.persistence.processinstance.variabletypes.VariableInstanceInfo v where v.processInstanceInfo.id = :processId] at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException( AbstractPropertyMapping.java:67) at org.hibernate.persister.entity.AbstractPropertyMapping.toType( AbstractPropertyMapping.java:61) at org.hibernate.persister.entity.AbstractEntityPersister.toType( AbstractEntityPersister.java:1385) at org.hibernate.hql.ast.tree.FromElementType.getPropertyType( FromElementType.java:302) Please help me resolve to this exception. Am i doing something wrong? Thanks & Regards Pardeep Ruhil if you take a look at this post: http://blog.athico.com/2009/09/drools-flow-variable-persistence.html you will see that there is a demo project with the configuration to work with MySQL. Greetings. 2009/10/7 <Pardeep.Ruhil(a)lntinfotech.com&gt; that are ______________________________________________________________________