Grokking Spring Boot
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Typed Configuration Properties

An operator wrote booking.payments.timeout=3 seconds in a settings file next to the jar. The booking service refused to start and printed this.

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to bind properties under 'booking.payments.timeout' to java.time.Duration:

    Property: booking.payments.timeout
    Value: "3 seconds"
    Origin: URL [file:config/application.properties] - 1:26
    Reason: failed to convert java.lang.String to @org.springframework.boot.context.properties.bind.DefaultValue java.time

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