[jboss-user] [JBoss Seam] - javax.servlet.ServletException: Error calling action method

[JoviJojo]

i modified jboss-seam booking example, created a new booking application to fit our needs. everything works fine until the last step, confirm booking. when i press the confirm button, i got the error message like below:
HTTP Status 500 - 

--------------------------------------------------------------------------------

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: Error calling action method of component with id _id16:_id54
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:121)
	org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:30)
	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)


root cause 

javax.faces.FacesException: Error calling action method of component with id _id16:_id54
	org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
	javax.faces.component.UICommand.broadcast(UICommand.java:106)
	javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
	javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:164)
	org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:316)
	org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:106)
	org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:30)
	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.

can you give me some tip on this one please...

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