spring.config.location not working on spring boot 2.0.0 M6

问题

I'm migrating one of my micro-services to Spring Boot 2.0.0.M6 and I got and error while using the --spring.config.location= option on the command line. The error is the following:

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'property' in value "${property}"
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:172) ~[spring-core-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:237) ~[spring-core-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:211) ~[spring-core-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:834) ~[spring-beans-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1081) ~[spring-beans-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1060) ~[spring-beans-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:578) ~[spring-beans-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91) ~[spring-beans-5.0.1.RELEASE.jar:5.0.1.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:367) ~[spring-beans-5.0.1.RELEASE.jar:5.0.1.RELEASE]
... 50 common frames omitted

If I don't use the custom property file everything works as intended or use the RELEASE versions. I'm starting the application with the following command:

java -jar application.jar --spring.config.location=app.properties

Update

I notice that when using this option Spring completely replaces the default application.properties from the project, unlike previous Spring versions which just overwrites the properties in the argument file. Is this a bug?

Update 2

Got a response from the team, apparently this is intended behavior. Trying to know now if there is a way to use the old versions behavior.

回答1:

As stated by the Spring team the correct way to use the old behavior from the spring.config.location is to use the new spring.config.additional-location

回答2:

Your project structure would be of great help. But aside from that.

Spring docs give an example of how to use the flag:

    --spring.config.location=classpath:/default.properties

Try resolving your application properties against the classpath.

来源：https://stackoverflow.com/questions/47209348/spring-config-location-not-working-on-spring-boot-2-0-0-m6