Hi All, We want to use JBoss to propose it as a BPM solution to our customers. We haven't decided yet how we will use it, as it is deployed in the starter kit or in a Servlet container, EJB... etc... It is said it is flexible and can be used in any "Java program"... First of all I need to understand how things work and I beleive working with jbpm.war will help a lot for that.... When I deploy the jbpm.sar with jboss-4.0.4.GA, it seems there are no problem with that: No error in the log file and the service appears in the jmx-console... But when I deploy the jbpm.war I got the following error: 2006-08-29 11:31:41,817 ERROR [STDERR] Exception in thread "JbpmScheduler" 2006-08-29 11:31:41,817 ERROR [STDERR] java.lang.IllegalAccessError: tried to access method net.sf.ehcache.CacheManager.()V from class org.hibernate.cache.EhCacheProvider 2006-08-29 11:31:41,817 ERROR [STDERR] at org.hibernate.cache.EhCacheProvider.start(EhCacheProvider.java:124) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:180) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1213) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.jbpm.persistence.db.DbPersistenceServiceFactory.getSessionFactory(DbPersistenceServiceFactory.java:90) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.jbpm.persistence.db.DbPersistenceService.getSessionFactory(DbPersistenceService.java:74) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.jbpm.persistence.db.DbPersistenceService.getSession(DbPersistenceService.java:78) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.jbpm.persistence.db.DbPersistenceService.getSchedulerSession(DbPersistenceService.java:244) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.jbpm.JbpmContext.getSchedulerSession(JbpmContext.java:529) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.jbpm.scheduler.impl.SchedulerThread.executeTimers(SchedulerThread.java:103) 2006-08-29 11:31:41,817 ERROR [STDERR] at org.jbpm.scheduler.impl.SchedulerThread.run(SchedulerThread.java:70) I tried to find this error in the forum with the a search but no luck.... If someone has managed to install the jbpm.war, please tell me what I am missing. (According to what I understand, the GDP use the uploadServlet of the jbpm.war to deploy the process definition.) Am still confused about the architecture and how all components are working together. For example, jbpm is package as a java library and I wonder what is the advantage to have jbpm as JMX service. How does this work ? Is the jbpm.war using the jbpm as a library... ? Or has it something to do with jbpm as a JMX service..... ? Sorry for all these questions but I can't find documentation explaining how all the components are working together (probably because I am new to Jboss...). Anyway thank you for your help, Arnaud. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3967984#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...