ClassCastException when getting bean from Spring app context, but not when Autowiring

I don't get this, I have a typical messageSource content.Language and I can get it like @Autowire protected MessageSource resource; but when I try to get it from app context with casting to MessageSource I get a cast exception how is autowire and getting bean from app context different ? (MessageSource) _applicationContext.getBean(name); java.lang.ClassCastException: org.springframework.context.support.ResourceBundleMessageSource cannot be cast to org.springframework.context.MessageSource it implements the interface, why it cannot be cast to it ?

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