multiple webflow context issue
I am using webflow with JSF and configured two DispatcherServlet in web,xml. servlet1 listens /spring/* and servlet2 listens to /spring2/*. Each servlet has its own spring context including flow-registry etc. In faces-config, I used a customized variable resolver that extends SpringBeanFacesELResolver to return appropriate Spring Context based on url pattern. Both flow registry registers a "account" flow. I then invoke the account flow using url http://localhost:8080/spring/account. the url on browser became to http://localhost:8080/spring/account?execution=e2s1. I then type the url http://localhost:8080/spring2/account?execution=e2s1 on another browser tab to invoke account flow from servlet2. I am expecting the flow should start fresh because servlet2 has its own spring context (and flow context?). However, the flow execution state seems to be kept between the two servlets. Indeed, if the input is bound to a spring bean with the same id, it shows different value depending url contains "spring" or "spring2". But if the input is bound to a flow var with same id. it always display the same value.
My questions is why both servlet share the same flow context even though I configured them to use different Spring Context including flow-registry and flow-executor etc.?