This problem was encountered with Snapshot build 98 of version 2.0.3.
The following bean definition of a custom-scoped bean (the class is a backport of JDK 1.5's java.util.concurrent.ArrayBlockingQueue to work on JDK 1.4):
Failed with the error below. The class in question has no empty constructor, it needs an integer value, which is specified by <constructor-arg>.
I am using CGLib 2.1.3 (the one that ships with Hibernate 3.2.1)
This problem does not occur in version 2.0.0