jbpm 5.4 with Oracle integration - Error - Could not connect task client

[red_ram_hat]

I am trying to integrate oracle database with jbpm 5 instead of using its own h2 database. 

I am using the following tools/APIs. I have provided the code and error below. Can any body help me understand and resolve the issue?

jbpm 5.4 

eclipse juno sr1 

websphere 7 

oracle 10g 

Java Code: 

Code for Knowledge Session creation: 

EntityManagerFactory emf = Persistence.createEntityManagerFactory( "org.jbpm.persistence.jpa" );

Environment env = KnowledgeBaseFactory.newEnvironment();

System.out.println(emf);

System.out.println(EnvironmentName.ENTITY_MANAGER_FACTORY);

env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );

env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager() );

env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );

Properties properties = new Properties();

properties.put("drools.processInstanceManagerFactory", "org.jbpm.persistence.processinstance.JPAProcessInstanceManagerFactory");

properties.put("drools.processSignalManagerFactory", "org.jbpm.persistence.processinstance.JPASignalManagerFactory");

KnowledgeSessionConfiguration config = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties);

System.out.println("config ** "+config);

System.out.println("kbase ** "+kbase);

System.out.println("env ** "+env);

System.out.println("env transaction manager: "+env.get("drools.transaction.TransactionManager"));

StatefulKnowledgeSession newStatefulKnowledgeSession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase,config,env);

Code for task handler connect: 

KnowledgeBase kbase = readKnowledgeBase("HelloProcess.bpmn");

StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);

CommandBasedWSHumanTaskHandler taskHandler = new CommandBasedWSHumanTaskHandler(ksession);

ksession.getWorkItemManager().registerWorkItemHandler("Human Task", taskHandler);

taskHandler.connect();

ksession.startProcess("Hello");

ksession.fireAllRules();

persistence.xml: 

<persistence-unit name="org.jbpm.persistence.jpa">

<provider>org.hibernate.ejb.HibernatePersistence</provider>

<class>org.drools.persistence.info.SessionInfo</class>

<class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>

<class>org.jbpm.persistence.processinstance.ProcessInstanceEventInfo</class>

<class>org.drools.persistence.info.WorkItemInfo</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.task.Task</class>

<class>org.jbpm.task.Comment</class>

<class>org.jbpm.task.Attachment</class>

<class>org.jbpm.task.I18NText</class>

<class>org.jbpm.task.SubTasksStrategy</class>

<class>org.jbpm.task.Deadline</class>

<class>org.jbpm.task.Escalation</class>

<class>org.jbpm.task.Reassignment</class>

<class>org.jbpm.task.Notification</class>

<class>org.jbpm.task.BooleanExpression</class>

<class>org.jbpm.task.User</class>

<class>org.jbpm.task.PeopleAssignments</class>

<properties>   

<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>

<property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver"/>

<property name="hibernate.connection.url" value="jdbc:oracle:thin:@192.192.192.192:1521:abcd" />

<property name="hibernate.connection.username" value="jbpm"/>

<property name="hibernate.connection.password" value="jbpm"/>    

<property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect"/>

<property name="hibernate.connection.autocommit" value="false"/>

<property name="hibernate.max_fetch_depth" value="3"/>

<property name="hibernate.hbm2ddl.auto" value="create" />

<property name="hibernate.show_sql" value="true" />

</properties>

</persistence-unit>

<persistence-unit name="org.jbpm.task">

<provider>org.hibernate.ejb.HibernatePersistence</provider>

<class>org.jbpm.task.Attachment</class>

<class>org.jbpm.task.Content</class>

<class>org.jbpm.task.BooleanExpression</class>

<class>org.jbpm.task.Comment</class>

<class>org.jbpm.task.Deadline</class>

<class>org.jbpm.task.Comment</class>

<class>org.jbpm.task.Deadline</class>

<class>org.jbpm.task.Delegation</class>

<class>org.jbpm.task.Escalation</class>

<class>org.jbpm.task.Group</class>

<class>org.jbpm.task.I18NText</class>

<class>org.jbpm.task.Notification</class>

<class>org.jbpm.task.EmailNotification</class>

<class>org.jbpm.task.EmailNotificationHeader</class>

<class>org.jbpm.task.PeopleAssignments</class>

<class>org.jbpm.task.Reassignment</class>

<class>org.jbpm.task.Status</class>

<class>org.jbpm.task.Task</class>

<class>org.jbpm.task.TaskData</class>

<class>org.jbpm.task.SubTasksStrategy</class>

<class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class>

<class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class>

<class>org.jbpm.task.User</class>

<class>org.drools.persistence.info.SessionInfo</class>

<class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>

<class>org.jbpm.persistence.processinstance.ProcessInstanceEventInfo</class>

<class>org.drools.persistence.info.WorkItemInfo</class>

<properties>

<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/>

<property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver"/>

<property name="hibernate.connection.url" value="jdbc:oracle:thin:@192.192.192.192:1521:abcd" />

<property name="hibernate.connection.username" value="jbpmtask"/>

<property name="hibernate.connection.password" value="jbpmtask"/>    

<property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect"/>

<property name="hibernate.connection.autocommit" value="false"/>

<property name="hibernate.max_fetch_depth" value="3"/>

<property name="hibernate.hbm2ddl.auto" value="create" />

<property name="hibernate.show_sql" value="true" />

</properties>

</persistence-unit>

</persistence>

ERROR Stack Trace: 

WARNING: Found unrecognized persistence provider "org.hibernate.ejb.HibernatePersistence" in place of OpenJPA provider.  This provider's properties will not be used.

Hibernate: select SESSIONINFO_ID_SEQ.nextval from dual

java.lang.IllegalArgumentException: Could not connect task client

  at org.jbpm.process.workitem.wsht.CommandBasedWSHumanTaskHandler.connect(CommandBasedWSHumanTaskHandler.java:123)

  at com.sample.execute.MigrateDB.dbMIgration(MigrateDB.java:50)

  at com.servlets.AServlet.doPost(AServlet.java:41)

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:738)

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)

  at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1657)

  at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:939)

  at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)

  at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:179)

  at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3935)

  at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)

  at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931)

  at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583)

  at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)

  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)

  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)

  at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)

  at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:83)

  at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)

  at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)

  at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)

  at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)

  at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)

  at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)

  at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)

  at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1604)