Hi Pardeep, I have gotten this functionality to work. I am using SQL Server, but that is just a difference in the persistence.xml or datasource.  You are seeing SessionInfo data, so your persistence is there, did you add this?      <class>org.drools.persistence.processinstance.variabletypes.JPAPersistedVariable</class> Here is the main points of my code.     EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.drools.persistence.jpa");     env = KnowledgeBaseFactory.newEnvironment();     env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);     VariablePersistenceStrategyFactory.getVariablePersistenceStrategy()             .setPersister("javax.persistence.Entity",                     "org.drools.persistence.processinstance.persisters.JPAVariablePersister");     session = JPAKnowledgeService.newStatefulKnowledgeSession(knowledgeBase, null, env);     KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(session, "log/claimsdemo");     trackingProcessEventListener = new TrackingProcessEventListener();     session.addEventListener(trackingProcessEventListener);     Map<String, Object> parameterMap =             new HashMap<String, Object>();     parameterMap.put("claim", claim);     processInstance = session.startProcess(CLAIM_FLOW, parameterMap); Bill ________________________________ From: &quot;Pardeep.Ruhil(a)lntinfotech.com&quot; <Pardeep.Ruhil(a)lntinfotech.com&gt; To: rules-users(a)lists.jboss.org Sent: Thu, October 29, 2009 5:56:18 AM Subject: [rules-users] Drools Persistence Prob : No values going into 'VaraibleInstanceInfo' Table Hi, I am working on persisting Drools session info into the database. For that I have taken a sample project from http://blog.athico.com/2009/09/drools-flow-variable-persistence.html. When I tried to debug the project, no values are inserted into the table 'VaraibleInstanceInfo' table. However In between the debugging I am able to see data going into the table 'SessionInfo' , 'ProcessInstaceInfo', WorkItemInfo' table. But no data is going into the 'VaraibleInstanceInfo' and 'ProcessInstanceEventInfo' table. I have taken the code for VariableInstanceInfo.java, SerializablePersistedVariable.java,  JPAPersistedVariable.java  and other required classes for running the project from  http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-persistence-jpa/src/main/java/org/drools/persistence/processinstance/ Kindly tell me what going wrong in this. I am using Mysql database for persistence storage. Thanks & Regards Pardeep Ruhil L&T Infotech Ltd Mumbai Ph: +919820283884 Larsen & Toubro Infotech Ltd. www.Lntinfotech.com This Document is classified as: L&T Infotech Proprietary   L&T Infotech Confidential   L&T Infotech Internal Use Only   L&T Infotech General Business   This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. ______________________________________________________________________