Your "shortList" field is changing somehow as you loop over it. Given that both the action bean and the jsp are both single threaded to the current request, it is probably not a real concurrency issue (unless you have a background thread and a singleton, which I doubt).
Anyway, perhaps your getter method, actionbean.getShortList() has some logic
in it that is changing the list and/or its contents?
I think you probably have
public List<T> getShortList() {
List<T> x = findStuffFromDB_OrDoSomethingToProduceList();
return x;
}
When essentially what you need is:
private List<T> shortList;
public List<T> getShortList() {return this.shortList};
public Resolution yourEvent() {
shortList = findStuffFromDB_OrDoSomethingToProduceList();
return new ForwardResolution("/WEB-INF/your-jsp.jsp");
}
Alternatively you could put the shortList= bit in an @Before method..
Problems like this one are easy to troubleshoot by running your container in
debug mode. Also the howto on unit testing with MockRoundtrip is a really big
time saver.
From: David Hamilton [mailto:dhamil...@hermitagelighting.com]
Sent: Tuesday, June 08, 2010 9:08 AM
To: stripes-users@lists.sourceforge.net
Subject: [Stripes-users] Exception when setting object array properties
Hello,
I've tried several different ways to solve this issue but I keep getting a
"java.util.ConcurrentModificationException" every time I try to loop over the
properties of a bean. Here are the (hopefully) relevant code snipites:
In the JSP:
<s:form beanclass="accounts.actions.ShowStatementActionBean">
<c:forEach items="${actionBean.shortList}" var="inv" varStatus="loop">
<tr> <td>${inv.line.invoiceNum}</td></tr>
<tr><s:text name="shortList[${loop.index}]"></s:text></tr>
</c:forEach>
</table>
</s:form>
The result is this exception:
WARNING: ApplicationDispatcher[/Public] PWC1231: Servlet.service() for servlet
jsp threw exception
java.util.ConcurrentModificationException
at
java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
at
org.apache.taglibs.standard.tag.common.core.ForEachSupport$SimpleForEachIterator.next(ForEachSupport.java:149)
at
org.apache.taglibs.standard.tag.common.core.ForEachSupport.next(ForEachSupport.java:171)
at
javax.servlet.jsp.jstl.core.LoopTagSupport.doAfterBody(LoopTagSupport.java:326)
....
I'm fairly new to Stripes (and JSP development in general) so I'm sure it's
something simple but I can't seem to figure out what..
Thanks,
David Hamilton
Web Coordinator
(615) 843-3337
Hermitage Lighting Gallery
www.hermitagelighting.com<http://www.hermitagelighting.com>
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