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"mvn clean install" fails if the message is commented out.

Error shown below:
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'greetingController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'message' in string value "${message}"
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:355)
snowdrop/spring-boot-configmap-booster,snowdrop/spring-boot-configmap-booster,snowdrop/spring-boot-configmap-booster