Searching Google on how to configure property file in Spring 3 and I got many different answers. I found that ReloadableResourceBundleMessageSource and PropertyPlaceholderConfigurer can be used for getting properties from property files. Can somebody please explain the difference between these?
PropertyPlaceholderConfigurer used for properties files to be used in the application context or inside the code with with @value.
ResourceBundleMessageSource used for Internationalization & Localization (i18n) of messages you want to show to the user, within jsp direct, or from your code by wiring message resources bean inside your component.
PropertyPlaceholderConfigurer
We use PropertyPlaceholderConfigurer when we need to load some property files whose properties are used in applicationcontext.xml of spring. We can use the properties directly using JSTL expressions.
ReloadableResourceBundleMessageSource
We use ReloadableResourceBundleMessageSource when we need to use the property files outside the applicationcontext.xml. The properties loaded using ReloadableResourceBundleMessageSource are not accessible in applicationcontext.xml
来源：https://stackoverflow.com/questions/20759737/propertyplaceholderconfigurer-vs-reloadableresourcebundlemessagesource