Ensure all properties map nicely to yaml

[hsoftxl]

logging.file=logs/app.log
logging.file.max-history=20 
logging.file.max-size=50MB 

how to config these properties in yml file

#log 
logging:
  file:  // how to config
    max-history: 30
    max-size: 50MB

[wilkinsona]

Thanks for getting in touch, but it feels like this is a question that would be better suited to Stack Overflow. As mentioned in the guidelines for contributing, we prefer to use GitHub issues only for bugs and enhancements. Feel free to update this issue with a link to the re-posted question (so that other people can find it) or add some more details if you feel this is a genuine bug.

[hsoftxl]

yaml file can not support config for logging.file=xx.log with logging.file.max-history=20

[hsoftxl]

@wilkinsona

[hsoftxl]

in application.properties we can use this:

logging.file=logs/app.log
logging.file.max-history=20
logging.file.max-size=50MB

bug in application.yml can not set these three properties in same time

[wilkinsona]

If you'd like us to spend some time investigating, you're going to have to spend some time to make sure that we're investigating the problem that you're seeing. As I already asked in #12522, please provide a minimal, complete, and verifiable example and we can re-open this issue and investigate.

[philwebb]

I think I finally understand the issue here. A sample would have been very useful. As would have including the full stack trace.

Given the following YAML:

logging:
  file: logs/app.log
    max-history: 20
    max-size: 50MB

The following exception is raised:

java.lang.IllegalStateException: Failed to load property source from location 'classpath:/application.yml'
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:481)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadForFileExtension(ConfigFileApplicationListener.java:446)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:419)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:329)
	at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:205)
	at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:188)
	at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:175)
	at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:161)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
	at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:74)
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:351)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:317)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234)
	at scratch.BindingApplication.main(BindingApplication.java:10)
Caused by: org.yaml.snakeyaml.scanner.ScannerException: mapping values are not allowed here
 in 'reader', line 3, column 16:
        max-history: 20
                   ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchValue(ScannerImpl.java:872)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:360)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:226)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingKey.produce(ParserImpl.java:557)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:157)
	at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:147)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:227)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:154)
	at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:249)
	at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:240)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:228)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:154)
	at org.yaml.snakeyaml.composer.Composer.composeDocument(Composer.java:122)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:84)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:123)
	at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:547)
	at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:161)
	at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:139)
	at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:75)
	at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:49)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:469)
	... 18 common frames omitted

You can work around it by doing this:

logging.file: logs/app.log 
logging:
  file: 
    max-history: 20
    max-size: 50MB