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Well, this is already supported as much it is possible for Spring 3.x @Configuration and @Bean annotated classes and methods. You just need to have a Spring XML configuration file configured with STS; within this config file you need to specify the </context:annotation-config> and create a bean with your @Configuration-annotated configuration class.
STS does currently not support the special JavaConfig ApplicationContext implementations.
We don't have support for old-style Spring JavaConfig (before it was merged with Spring Framework and itself deprecated).