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Posted to users@wicket.apache.org by Chris <ch...@gmx.at> on 2015/02/06 17:56:06 UTC
Sortable - ConcurrentModificationException
Hi Sebastian,
I am using the method #ListUtils.move to sort a list of domain objects as soon as the method #onUpdate is called within a sortable object:
In the first request, everything is fine, but in the second request I am receiving following error:
Root cause:
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.next(ArrayList.java:851)
Can you give me a hint why this error occurs and how to fix it?
@Override
public void onUpdate(AjaxRequestTarget target, String item, int index) {
super.onUpdate(target, item, index);
user.sortObj(item, index);
}
*****************************
Class User:
private final List<Item> selectedItems = Lists.newArrayList();
public void sortItems(String itemName, int index) {
for (Item currentItem : selectedItems) {
if (itemName.equals(currentItem.getName())) {
ListUtils.move(currentItem, index, selectedItems);
}
}
}
Thanks a lot,
Chris
Re: Sortable - ConcurrentModificationException
Posted by Sebastien <se...@gmail.com>.
Hi Chris,
Right, you probably you can use an iterator instead of the "foreach"
statement...
Thanks for letting know you solved it! :)
Best regards,
Sebastien.
On Fri, Feb 6, 2015 at 6:05 PM, Chris <ch...@gmx.at> wrote:
> I have fixed it - it was because of calling the method within the for loop.
>
> br, Chris
>
>
>
> > Am 06.02.2015 um 17:56 schrieb Chris <ch...@gmx.at>:
> >
> > Hi Sebastian,
> >
> > I am using the method #ListUtils.move to sort a list of domain objects
> as soon as the method #onUpdate is called within a sortable object:
> > In the first request, everything is fine, but in the second request I am
> receiving following error:
> > Root cause:
> >
> > java.util.ConcurrentModificationException
> > at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
> > at java.util.ArrayList$Itr.next(ArrayList.java:851)
> >
> > Can you give me a hint why this error occurs and how to fix it?
> >
> > @Override
> > public void onUpdate(AjaxRequestTarget target, String item, int index) {
> > super.onUpdate(target, item, index);
> > user.sortObj(item, index);
> >
> > }
> > *****************************
> > Class User:
> > private final List<Item> selectedItems = Lists.newArrayList();
> > public void sortItems(String itemName, int index) {
> > for (Item currentItem : selectedItems) {
> > if (itemName.equals(currentItem.getName())) {
> > ListUtils.move(currentItem, index, selectedItems);
> > }
> > }
> > }
> >
> > Thanks a lot,
> > Chris
> >
>
>
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Re: Sortable - ConcurrentModificationException
Posted by Chris <ch...@gmx.at>.
I have fixed it - it was because of calling the method within the for loop.
br, Chris
> Am 06.02.2015 um 17:56 schrieb Chris <ch...@gmx.at>:
>
> Hi Sebastian,
>
> I am using the method #ListUtils.move to sort a list of domain objects as soon as the method #onUpdate is called within a sortable object:
> In the first request, everything is fine, but in the second request I am receiving following error:
> Root cause:
>
> java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
> at java.util.ArrayList$Itr.next(ArrayList.java:851)
>
> Can you give me a hint why this error occurs and how to fix it?
>
> @Override
> public void onUpdate(AjaxRequestTarget target, String item, int index) {
> super.onUpdate(target, item, index);
> user.sortObj(item, index);
>
> }
> *****************************
> Class User:
> private final List<Item> selectedItems = Lists.newArrayList();
> public void sortItems(String itemName, int index) {
> for (Item currentItem : selectedItems) {
> if (itemName.equals(currentItem.getName())) {
> ListUtils.move(currentItem, index, selectedItems);
> }
> }
> }
>
> Thanks a lot,
> Chris
>
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