Clears the specified sub-pool, removing all pooled instances corresponding to the given <code>key</code>. Exceptions encountered destroying idle instances are swallowed but notified via a {@link SwallowedExceptionListener}.
@param key the key to clear
See Implementation
Clears the specified sub-pool, removing all pooled instances corresponding to the given <code>key</code>. Exceptions encountered destroying idle instances are swallowed but notified via a {@link SwallowedExceptionListener}.
@param key the key to clear