Thx, This is the trace within eclipse : javax.servlet.ServletException: java.lang.NullPointerException | org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286) | org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) | org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449) | javax.servlet.http.HttpServlet.service(HttpServlet.java:617) | javax.servlet.http.HttpServlet.service(HttpServlet.java:717) | | | cause mère | | java.lang.NullPointerException | org.jbpm.pvm.internal.svc.ExecutionServiceImpl.startProcessInstanceByKey(ExecutionServiceImpl.java:66) | javaclass.DAO.BillDAO.findByExample(BillDAO.java:45) | javaclass.action.ListBillAction.execute(ListBillAction.java:29) | org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58) | org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67) | org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51) | org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191) | org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305) | org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191) | org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283) | org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) | org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449) | javax.servlet.http.HttpServlet.service(HttpServlet.java:617) | javax.servlet.http.HttpServlet.service(HttpServlet.java:717) | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4253738#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...