Thanks.. In my Jboss server there are 2 ehcache jar jn both Portal.sar and JBPM.sar. so i removed ehcache from portal.sar. but even now i am getting the following exception. please could you let me know the root cause of the problem java.lang.IllegalAccessError: tried to access method net.sf.ehcache.CacheManager .()V from class org.hibernate.cache.EhCacheProvider at org.hibernate.cache.EhCacheProvider.start(EhCacheProvider.java:124) at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java: 180) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.jav a:1213) at org.jbpm.persistence.db.DbPersistenceServiceFactory.getSessionFactory (DbPersistenceServiceFactory.java:90) at org.jbpm.persistence.db.DbPersistenceService.getSessionFactory(DbPers istenceService.java:74) at org.jbpm.persistence.db.DbPersistenceService.getSession(DbPersistence Service.java:78) at org.jbpm.persistence.db.DbPersistenceService.getGraphSession(DbPersis tenceService.java:217) at org.jbpm.JbpmContext.getGraphSession(JbpmContext.java:537) at org.jbpm.JbpmContext.deployProcessDefinition(JbpmContext.java:173) at org.apache.jsp.Testdeploy_jsp._jspService(Testdeploy_jsp.java:51) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper .java:332) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3 14) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi lter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl icationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF ilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV alve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV alve.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit yAssociationValve.java:175) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv e.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j ava:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j ava:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal ve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav a:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p rocessConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo int.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor kerThread.java:112) at java.lang.Thread.run(Thread.java:534) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991899#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...