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BeanFactoryPostProcessor is an interface that allows to execute code before the bean factory (or application context) is initialized.

	public class BeanFactoryPostProcessorImpl implements BeanFactoryPostProcessor {

		@Override
		public void postProcessBeanFactory(ConfigurableListableBeanFactory clbf)
				throws BeansException {
			// Do something
		}
	}

The order of execution is:
1) The BeanFactoryPostProcessor implementation is first called
2) The BeanFactory or ApplicationContext is initialized
3) The bean singletons are instantiated.

             * * *

PropertyPlaceholderConfigurer is an example of a Spring class that implements this feature. It loads a property file making the values available to the application context.

	
	<bean id="course" class="org.davis.Course">
		<property name="teacher" value="${school.teacher.name}"/>
	</bean>

	<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="courseInfo" value="course.properties"/> 
	</bean>

Here's the property file (in the same path as the xml configuration file):

	school.teacher.name=Ale