RE: [Wicket-user] Concurrent Modification Exception -- NEVER MIND!

[Frank Silbermann]

Never mind!  The problem had nothing to do with Wicket.  My error was trying to delete elements of the very list I was iterating:     for (CheckboxData cbd : listToBePruned ){       if ( !cbd.isChecked() ) {         listToBePruned.remove(cbd);       }     }   A different looping strategy solved it.  /Frank   -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Frank Silbermann Sent: Tuesday, May 09, 2006 12:35 PM To: wicket-user@lists.sourceforge.net Subject: [Wicket-user] Concurrent Modification Exception   I created a CheckboxData type containing a boolean (checked) and a label.   I created a CheckboxDataPanel whose constructor takes a CheckboxData object, and which displays a checkbox and the label – each using a PropertyModel built from the Checkbox Data object.   I constructed a ListView using a List<CheckboxData>, which displays a CheckboxDataPanel for each item.   I have a button which removes from the List<CheckboxData> every CheckboxData object whose check field is unchecked.  When I click this button, I would expect the ListView would shrink – perhaps down to nothing if none were checked.  When I press it to remove the last remaining item, however, I get a java.util.ConcurrentModificationException.   What am I doing wrong?  I’ve been using an ArrayList as my List implementation, but I get the same result using a Vector.  Could I avoid this problem by using a CheckboxGroup instead of my own ListView?