What does the error message "java.util.ConcurrentModificationException" indicate in Axis 1.4.1?

edit

The error message "java.util.ConcurrentModificationException" indicates that there was an attempt to modify a Java collection or similar data structure while it was being concurrently iterated over. This can occur when two or more threads accessing the same data structure at the same time or when the same thread attempts to modify a collection while it is being iterated. In the context of Axis 1.4.1, this error may occur if multiple threads are accessing the same instance of an Axis object, such as a message context or configuration context.