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It's a way to tell Spring there is some processing to be done before or after the initialization of a bean. This is achieved by implementing BeanPostProcessor.

	public class DisplayNameBeanPostProcessor implements BeanPostProcessor {

		@Override
		public Object postProcessAfterInitialization(Object bean, String name)
				throws BeansException {
			System.out.println("After " + name + " initialization");
			return arg0;
		}

		@Override
		public Object postProcessBeforeInitialization(Object bean, String name)
				throws BeansException {
			System.out.println("Before " + name + " initialization");
			return arg0;
		}
	}