How to print and int with a c:out tag

Question

Hi there,
Just a silly question. I am trying to print out the size() of a List using the tag below.<c:out value="${list.size}"/>But I am getting the following error: "An error occurred while evaluating custom action attribute "value" with value "${activityCtrl.openActivitiesForResource.size}": The "." operator was supplied with an index value of type "java.lang.String" to be applied to a List or array, but that value cannot be converted to an integer. (null)"
Can this tag not print int's or is it that I am calling "size()" which is not a get/set property. Please help.
Thanks,
Marius Botha

Answer 1

Hi there,
Just a silly question. I am trying to print out the
size() of a List using the tag below.<c:out
value="${list.size}"/>But I am getting the following error: "An error
occurred while evaluating custom action attribute
"value" with value
"${activityCtrl.openActivitiesForResource.size}": The
"." operator was supplied with an index value of type
"java.lang.String" to be applied to a List or array,
but that value cannot be converted to an integer.
(null)"
Can this tag not print int's or is it that I am
calling "size()" which is not a get/set property.
Please help.It is because size() does not follow the JavaBeans naming convention (getSize()).
If you have JSP 2.0 container like Tomcat 5, and JSTL 1.1 then you can use the function library to get the size of the list:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<c:out value="${fn:length(list)}"/>Otherwise you will have to use scriptlets of make some utility JavaBean or CustomTag that does the job.
>
Thanks,
Marius Botha