Commit # 15787
A new attribute "overridable" was added in the SU.
If a XSL parameter from the exchange tries to override a SU XSL parameter while it can't, then an exception is thrown.
The class loader restoration was moved in a finally block.
Notice that a fault is not thrown in case of unsuccessful overriding.
In fact, this component does not set any fault.
When something fails (invalid operation, transformation failure), it only sets errors on the exchanges.
That should be differed in a different bug, meaning replacing the setError by setFault, with a custom exception.
At least, that would be compatible with the InOut MEP of the operations.
Commit # 15784