java.util.ConcurrentModificationException in JasperReports

Question

We have a web application deployed to Websphere 6.1.0.19 on Windows. We occasionally see this ConcurrentModificationException on a few of our reports. We are using JasperR

Answer 1

This is caused by the backing store of the iterator being altered while the iterator is in use. This is not a concurrency problem related to threading, as it is easy enough to do on a single thread as well.

More detailed description on this question

Your biggest problem now will be if it is fixable by you or a bug in the Jasper code.