http://struts.apache.org/release/2.3.x/docs/create-session-interceptor.html
2014-02-06 19:42 GMT+01:00 Dave Newton <davelnew...@gmail.com>: > There's the session interceptor. It's unusual that you'd execute an action > and not have a session, though, since JSP pages will create their own if > one doesn't exist and it (the JSP) isn't explicitly configured not to > create one. > > > On Thu, Feb 6, 2014 at 1:33 PM, Greg Lindholm <greg.lindh...@gmail.com>wrote: > >> My Interceptor is expecting a session to exist, but I'm occasionally >> getting exceptions that say the session doesn't exist, and since this >> occurs after the action has executed and response has been committed it is >> too late to create a session. >> >> So my question is; From with an Interceptor is there a way to determine if >> a session already exists (or doesn't exist)? >> >> I realize I could just catch the exception but I would rather not cause the >> exception if I can avoid it. >> >> The object returned from invocation.getInvocationContext().getSession() is >> not really a map, it is a wrapper around the session that implements a map >> interface. Using the put() method above will create the session if it >> doesn't exist (and response hasn't already been committed.) >> >> I suppose I could get the HttpServletRequest object and do a >> getSession(false) if there isn't a more "struts" way of finding out. >> >> >> >> >> On Thu, Feb 6, 2014 at 12:28 PM, Ken McWilliams <ken.mcwilli...@gmail.com >> >wrote: >> >> > The OP has abstracted away most of the details, he is working with >> > Map<String, Object>! The session is not generally struts2s responsibility >> > it, generally it is maintained by the web container. Tomcat/Glassfish, >> etc. >> > And generally you would consider it in such an environment to always >> exist. >> > What kind of container are you deploying your application in? I recall >> > there being an interceptor that will attempt to create a session for >> light >> > weight containers, however if struts needs to create such a session >> object >> > it is doubtful that the container will be able to use it in a meaningful >> > way. >> > >> > >> > On Thu, Feb 6, 2014 at 9:58 AM, Maurizio Cucchiara < >> mcucchi...@apache.org >> > >wrote: >> > >> > > Hi Greg, >> > > I seem to recall that this is not the best way to handle the session >> and >> > > generally speaking, it always better to abstract as much as possible >> > http's >> > > details >> > > >> > > I could be wrong, but It would be better if your action implements a >> > > specific interface (SessionAware or HttpSessionAware) >> > > >> > > Twitter :http://www.twitter.com/m_cucchiara >> > > G+ :https://plus.google.com/107903711540963855921 >> > > Linkedin :http://www.linkedin.com/in/mauriziocucchiara >> > > VisualizeMe: >> http://vizualize.me/maurizio.cucchiara?r=maurizio.cucchiara >> > > >> > > Maurizio Cucchiara >> > > >> > > >> > > On 6 February 2014 14:14, Greg Lindholm <greg.lindh...@gmail.com> >> wrote: >> > > >> > > > I have an Interceptor that wants to put something in the session >> after >> > > the >> > > > action has executed. >> > > > >> > > > But if the session doesn't already exist I get an exception: >> > > > >> > > > java.lang.IllegalStateException: Cannot create a session after the >> > > response >> > > > has been committed >> > > > How can I determine if the session already exists from within an >> > > > Interceptor? >> > > > >> > > > public String doIntercept(ActionInvocation invocation) throws >> > Exception >> > > > { >> > > > String result = invocation.invoke(); >> > > > Map<String, Object> session = >> > > > invocation.getInvocationContext().getSession(); >> > > > session.put(key, value); // throws exception if session doesn't >> > exist >> > > > return result; >> > > > } >> > > > >> > > > Thanks >> > > > Greg >> > > > >> > > >> > >> > > > > -- > e: davelnew...@gmail.com > m: 908-380-8699 > s: davelnewton_skype > t: @dave_newton <https://twitter.com/dave_newton> > b: Bucky Bits <http://buckybits.blogspot.com/> > g: davelnewton <https://github.com/davelnewton> > so: Dave Newton <http://stackoverflow.com/users/438992/dave-newton> --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@struts.apache.org For additional commands, e-mail: user-h...@struts.apache.org
