Way of using EL.

Hello.
I'm wroking on my assignment,now.
And I found my way of using expresion language is wrong....
I use HashMap and I put elements like below.
String username = request.getParameter("username");
String userpage = request.getParameter("pagename");
hashmap.put(username +"_" + pagename, "Here is some comments of the user")so I want to call the key "username+"_"+pagename".
and I tried several ways like below using EL;
<c:out value = "${mybean.hashmap[param.username_param.pagename]}">or
<c:out value= "&{mybean.hashmap[param.username +'_'+ param.pagename]}"something like this.
I can run both codes, but it doesn't show any elements of the key...
does anybody know how to write if the name of key is {username +"_"+userpage}??

Easiest way would be to split this into two statements
<c:set var="mapKey">${param.username}_${param.pagename]}</c:set>
<c:out value="${mybean.hashmap[mapKey]}"/>

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Message was edited by:
sbkenned

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