java - Effective way how to handle ModelMap between Controllers, using forwarding in Spring MVC -

what elegant/effective way, how handle model between controllers in spring mvc 3.2. redirecting controller use forward method, there not necessary new instance of request , model data should accessible (if not wrong). there way how catch model, added in first controller?

(i know redirectattributes, may better/easier method)

example:

@controller public class webpagecontroller{          @requestmapping( value = { "/{code}" } )         public string handlefirstlevel(@pathvariable string code, modelmap modelmap) throws pagenotfoundeception{             final webpage webpage = getwebpage(code);             modelmap.put(webpage_model_key, preparemodel(webpage));              return "forward:some-url";         }          private map<string, object> preparemodel(webpage webpage){             map<string, object> model = new hashmap<string, object>();             model.put("webpage", webpage);             return model;         }          // other code     }      @controller     public class specialwebpagecontroller{          @requestmapping( value = { "/some-url" } )         public string handlefirstlevel(@pathvariable string code, modelmap modelmap) throws pagenotfoundeception{             // need access appended model add other data             return "specialviewname";         }      } 

thank you

when have handler method returns string, string considered view name. prefix of forward, spring requestdispatcher specified path , forward it. part of process include taking model modelandview created request handling cycle , putting attributes httpservletrequest attributes.

the servlet container take requestdispatcher#forward(..) , again use dispatcherservlet handle it. dispatcherservlet create new modelandview new model handling cycle. therefore model doesn't contain of attributes before httpservletrequest attributes do.

in case, this

modelmap.put(webpage_model_key, preparemodel(webpage)); 

will end being in

httpservletrequest request = ...; request.getattribute(webpage_model_key);