Oracle WebCenter 11g and ConcurrentModificationException

I came accross recently a very weird issue on Oracle WebCenter 11g PS4 (11.1.1.5).

I had a page, with four portlets. One of them had a portlet parameter. When I tried to provide a value for that portlet parameter at runtime (using the WebCenter Administrator), i got a ConcurrentModificationException exception. Here is a snippet from the log file:

java.util.ConcurrentModificationException
at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)
at java.util.LinkedList$ListItr.next(LinkedList.java:696)
at oracle.portlet.client.containerimpl.event.EventManagerImpl.fireEvent(EventManagerImpl.java:117)

After loggin an SR, this is a known issue and Oracle has a fix for it (patch 10427778).