How to run a timer

[s_aliakbary]

Hi All
I want to use timer for a task but I'm not sure about the way. I have added a timer to my task node(avan-task-node is extended from task-node), but it does not work. I expect that after 30seconds the node is leaved to "someTransition"

<avan-task-node name="Review" label="review">
 <timer name="timer1" duedate="30 seconds" transition="someTransition">
 </timer>
.
.
.
</avan-task-node>

Is it correct? Should I do anything else? e.g. should I add something to web.xml to run a scheduler thread?

Thanks in advance

[s_aliakbary]

Hi again
According to some posts on this forum, I added these lines to my web.xml :

 <servlet>
 <servlet-name>JbpmThreadsServlet</servlet-name>
 <servlet-class>org.jbpm.web.JbpmThreadsServlet</servlet-class>
 <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
 <servlet-name>JbpmThreadsServlet</servlet-name>
 <url-pattern>/threads</url-pattern>
 </servlet-mapping>

But now every 5 seconds I see an exception :

org.hibernate.HibernateException: /hibernate.cfg.xml not found
at org.hibernate.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:147)
at org.hibernate.cfg.Configuration.getConfigurationInputStream(Configuration.java:1287)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1309)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1296)
at org.jbpm.db.hibernate.HibernateHelper.createConfiguration(HibernateHelper.java:93)
at org.jbpm.persistence.db.DbPersistenceServiceFactory.getConfiguration(DbPersistenceServiceFactory.java:68)
at org.jbpm.persistence.db.DbPersistenceServiceFactory.getSessionFactory(DbPersistenceServiceFactory.java:90)
at org.jbpm.persistence.db.DbPersistenceService.getSessionFactory(DbPersistenceService.java:74)
at org.jbpm.persistence.db.DbPersistenceService.getSession(DbPersistenceService.java:78)
at org.jbpm.persistence.db.DbPersistenceService.getMessagingSession(DbPersistenceService.java:234)
at org.jbpm.JbpmContext.getMessagingSession(JbpmContext.java:411)
at org.jbpm.msg.db.DbMessageService.<init>(DbMessageService.java:49)
at org.jbpm.msg.db.DbMessageServiceFactory.openService(DbMessageServiceFactory.java:32)
at org.jbpm.svc.Services.getService(Services.java:136)
at org.jbpm.svc.Services.getMessageService(Services.java:172)
at org.jbpm.msg.command.CommandExecutorThread.executeCommand(CommandExecutorThread.java:111)
at org.jbpm.msg.command.CommandExecutorThread.run(CommandExecutorThread.java:79)

(I'm using springmodules to integrate jbpm to my project, so I have not any hibernate.cfg.xml file)
Any idea?