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Can @ConfigurationProperties annotated class be auto refreshed when a value is changed in application.properties ?

Or do we have to restart to make the new value apply?

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Short answer: "no". There is no general way to know if a change in application.properties requires a restart (e.g. a TCP port change) or not. If you know that a change will not require a restart then you can rebind the configuration properties using the PropertiesConfigurationFactory (or the public API of ConfigurationPropertiesBindingPostProcessor).

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