using EL to get the keySet of a HashMap

[Pat Farrell]

I have a HashMap that when I store it to the Session, and ask EL to display it, it works great.
Thus ${yearlycits} converts to this:

{1989=[4799156_1989-01-17], 1998=[5715314_1998-02-03, 5724424_1998-03-03], 1999=[5960411_1999-09-28, 5987140_1999-11-16]}

As you can see, the keys are Long, and the value is a list of String. You can notice, if you look closely, that the keys are not consecutive, they are really just

{1989, 1998, 1999}

What I want to do is get the keySet so I can then do a for-loop for each key value, get the list of Strings, and process them.

${yearlycits.keySet}

the view .jsp blows up:

org.apache.jasper.JasperException: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)

What am I doing wrong? I think I'm approaching it incorrectly.

Thanks
Pat

[Bear Bibeault]

You can iterate over the Map and each iteration will be an instance of Map.Entry from which you can get they key and the value.

[Pat Farrell]

Thanks.

Following the idea, this works:

                <c:forEach items="${yearlycits}" var="entry" >
                    ${entry.key} :==:<br> 
                    <c:forEach items="${entry.value}" var="cited">
                        ${cited}<br>
                    </c:forEach>
                     <br>
                </c:forEach>

[Bear Bibeault]