Hi , when i run the below code with 2 or more thread i am getting deadlock error. below attached "persistence.xml, jndi prop and datasource code". Kindly help to solve the error public static final void main(String[] args){ KnowledgeBuilder knowledgeBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); knowledgeBuilder.add(ResourceFactory.newClassPathResource("samplerulefile.rf"), ResourceType.DRF); KnowledgeBase kbase = knowledgeBuilder.newKnowledgeBase(); EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.drools.persistence.jpa"); Environment env = KnowledgeBaseFactory.newEnvironment(); env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf); BitronixTransactionManager transactionManager = TransactionManagerServices.getTransactionManager(); env.set(EnvironmentName.TRANSACTION_MANAGER, transactionManager); StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env); ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new NotificationWorkItemHandler()); JPAWorkingMemoryDbLogger auditlog = new JPAWorkingMemoryDbLogger(ksession); ProcessInstance p = (ProcessInstance) ksession.startProcess("ruleid",null); auditlog.dispose(); ksession.dispose(); } * persistence.xml: * <?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.drools.persistence.jpa"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <jta-data-source>jdbc/processInstanceDS</jta-data-source> <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class> <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class> <class>org.drools.persistence.info.SessionInfo</class> <class>org.drools.persistence.info.WorkItemInfo</class> <class>org.drools.persistence.processinstance.variabletypes.VariableInstanceInfo</class> <class>org.jbpm.process.audit.ProcessInstanceLog</class> <class>org.jbpm.process.audit.NodeInstanceLog</class> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect" /> <property name="hibernate.max_fetch_depth" value="3" /> <property name="hibernate.hbm2ddl.auto" value="update" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup" /> </properties> </persistence-unit> </persistence> *jndi property:* java.naming.factory.initial=bitronix.tm.jndi.BitronixInitialContextFactory *datasource:* PoolingDataSource ds = new PoolingDataSource(); ds.setUniqueName("jdbc/processInstanceDS"); ds.setClassName("oracle.jdbc.xa.client.OracleXADataSource"); ds.setMaxPoolSize(3); ds.setAllowLocalTransactions(true); ds.getDriverProperties().put("user", "username"); ds.getDriverProperties().put("password", "password"); ds.getDriverProperties().put("URL","jdbc:oracle:thin:@192.168.1.115:1521:TEST"); ds.setAllowLocalTransactions(true); ds.init(); Regards Dhinesh -- View this message in context: http://drools.46999.n3.nabble.com/rules-users-Drools-Ruleflow-deadlock-is... Sent from the Drools: User forum mailing list archive at Nabble.com.