The following comment has been added to this issue:
Author: fabrizio giustina
Created: Thu, 18 Nov 2004 5:26 AM
Body:
> Yes and that's the whole idea. It should be a runtime expression but there
> should be no null pointer exception.
?
I can't understand your point, just use pageContext.getAttribute("whatever")
and you will got no NPE, this is the correct usage. If you use a rtexpr in id
and try to use this id as a variable you will surely get a NPE.
When I say that it's not possible to declare a variable from the value of an
attribute containg a rtexpr I mean THERE IS NO WAY TO DO THAT.
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View this comment:
http://jira.codehaus.org/browse/DISPL-56?page=comments#action_26716
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View the issue:
http://jira.codehaus.org/browse/DISPL-56
Here is an overview of the issue:
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Key: DISPL-56
Summary: unable to dinamically generate multiple tables on the same page
with indipendent sorting (different id)
Type: Bug
Status: Resolved
Priority: Major
Resolution: FIXED
Original Estimate: Unknown
Time Spent: Unknown
Remaining: Unknown
Project: DisplayTag
Components:
Container Compability
Fix Fors:
1.0 RC2
Versions:
1.0 RC1
Assignee: fabrizio giustina
Reporter: Keith Garry Boyce
Created: Sun, 10 Oct 2004 7:48 AM
Updated: Thu, 18 Nov 2004 5:26 AM
Description:
If I pass id in as <%= string %> value I get classcast exception
The code below with varying name also doesn't work. I sent this also to you
guys because my mail in the past hasn't got onto forum.
Thanks,
Garry
Here is an example of the problem (below is a workaround but you probably have
better one):
<%@ taglib uri="http://displaytag.sf.net"; prefix="display" %>
<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<html>
<body>
test
<%!
public class ValueBean {
public ValueBean(String value) {
this.value=value;
}
private String value;
public String getValue() {
return this.value;
}
}
%>
<%
List theList = new ArrayList();
theList.add(new ValueBean("1"));
theList.add(new ValueBean("2"));
theList.add(new ValueBean("3"));
for (int i=0;i<3;i++) {
request.setAttribute("row" + String.valueOf(i),new ArrayList(theList));
%>
<display:table class="disp"
id="row"
name="<%= "row" + String.valueOf(i) %>"
sort="list" >
<display:column property="value" sortable="true"/>
</display:table>
<% } %>
</body>
</html>
Workaround:
have anonther attribute called tableId. I'm using reflection code for
visibility issues.
/*
* TableTag2.java
*
* Copyright 2004 by Electronic Data Systems
* Corporation. All rights reserved.
*
* An unpublished work created Aug 5, 2004, 2004. This work is a
* trade secret of EDS and unauthorized use or copying
* is prohibited.
*
*/
package org.displaytag.tags;
import java.lang.reflect.Field;
import org.displaytag.util.ParamEncoder;
/**
* @author jztb88
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class TableTag2 extends TableTag {
private String tableId;
/**
* @return Returns the tableId.
*/
public String getTableId() {
return tableId;
}
/**
* @param tableId The tableId to set.
*/
public void setTableId(String tableId) {
try {
Field fld =
TableTag.class.getDeclaredField("paramEncoder");
fld.setAccessible(true);
if (fld.get(this) == null) {
fld.set(this,new ParamEncoder(this.id +
this.tableId));
}
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchFieldException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
this.tableId = tableId;
}
}
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