SpringBoot The project cannot be started once the key in the yaml configuration file contains the word "no"

spring-boot Version: spring-boot-starter-parent 2.1.8.RELEASE & spring-boot-starter-parent 2.6.6 Java Version: 1.8.0_212 OS Version: macOS 11.6.7 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Step1: write a key-value pair in the application.yaml which the key contains the word "no"

neo:
  test:
    no:
      value: true123

Step2: use @Value (import org.springframework.beans.factory.annotation.Value;)

@Value("${neo.test.no.value}")
String noValue;

Step3: print the value

@GetMapping("/test/no")
public String testNo() {
    log.info("noValue: {}", noValue);
}

Step4: try to start the project then failed here is the error log:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'neo.test.no.value' in value "${neo.test.no.value}"

Finally, I wrote the same conf (neo.test.no.value = true123) into the application.properties, It can successfully start.

Comment From: philwebb

You're probably hitting the Norway problem. Try the following:

neo:
  test:
    "no":
      value: true123