SpringSource/spring-framework — pull request #176 by philwebb (2012-10-31 05:26:02+00:00)
Title:  Prevent duplicate @Import processing

Refactor ConfigurationClassParser to recursively find values from
all @Import annotations, combining them into a single unique set.

This change prevents ImportBeanDefinitionRegistrars from being
invoked twice.

Issue: SPR-9925