Spring Boot app fails to start when user.language=tr

Overwriting Jackson configuration in application.properties i.e.

spring.jackson.mapper.accept-case-insensitive-properties=false

causes app fail to start with the following error:

$ java -Duser.language=tr -jar springboot-localebugdemo-0.0.1-SNAPSHOT.jar
20:45:12.014 [main] INFO springboot.localebugdemo.LocaleBugDemoApplication - user.language=tr

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::       (v1.5.10.RELEASE)

2018-02-25 20:45:12.683  INFO 3448 --- [           main] s.l.LocaleBugDemoApplication             : Starting LocaleBugDemoApplication on DanBarMBP with PID 3448 (/Users/danbar/Projects/lab/springboot-localebugdemo/build/libs/springboot-localebugdemo-0.0.1-SNAPSHOT.jar started by danbar in /Users/danbar/Projects/lab/springboot-localebugdemo/build/libs)
2018-02-25 20:45:12.684 DEBUG 3448 --- [           main] s.l.LocaleBugDemoApplication             : Running with Spring Boot v1.5.10.RELEASE, Spring v4.3.14.RELEASE
2018-02-25 20:45:12.684  INFO 3448 --- [           main] s.l.LocaleBugDemoApplication             : No active profile set, falling back to default profiles: default
2018-02-25 20:45:14.157  INFO 3448 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-02-25 20:45:14.159  INFO 3448 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.27
2018-02-25 20:45:14.267  INFO 3448 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-02-25 20:45:14.489 ERROR 3448 --- [           main] o.s.b.b.PropertiesConfigurationFactory   : Properties configuration failed validation
2018-02-25 20:45:14.490 ERROR 3448 --- [           main] o.s.b.b.PropertiesConfigurationFactory   : Field error in object 'spring.jackson' on field 'null': rejected value [accept-case-insensitive-properties]; codes [typeMismatch.spring.jackson.null,typeMismatch.null,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [spring.jackson.null,null]; arguments []; default message [null]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'com.fasterxml.jackson.databind.MapperFeature' for property 'null'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [com.fasterxml.jackson.databind.MapperFeature] for value 'accept-case-insensitive-properties'; nested exception is java.lang.IllegalArgumentException: No enum constant com.fasterxml.jackson.databind.MapperFeature.accept-case-insensitive-properties]
2018-02-25 20:45:14.492  WARN 3448 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'standardJacksonObjectMapperBuilderCustomizer' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration.class]: Unsatisfied dependency expressed through method 'standardJacksonObjectMapperBuilderCustomizer' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'spring.jackson-org.springframework.boot.autoconfigure.jackson.JacksonProperties': Could not bind properties to JacksonProperties (prefix=spring.jackson, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'spring.jackson' on field 'null': rejected value [accept-case-insensitive-properties]; codes [typeMismatch.spring.jackson.null,typeMismatch.null,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [spring.jackson.null,null]; arguments []; default message [null]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'com.fasterxml.jackson.databind.MapperFeature' for property 'null'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [com.fasterxml.jackson.databind.MapperFeature] for value 'accept-case-insensitive-properties'; nested exception is java.lang.IllegalArgumentException: No enum constant com.fasterxml.jackson.databind.MapperFeature.accept-case-insensitive-properties]
2018-02-25 20:45:14.495  INFO 3448 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2018-02-25 20:45:14.521 ERROR 3448 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Binding to target org.springframework.boot.autoconfigure.jackson.JacksonProperties@4b4523f8 failed:

    Property: spring.jackson.null
    Value: accept-case-insensitive-properties
    Reason: Failed to convert property value of type 'java.lang.String' to required type 'com.fasterxml.jackson.databind.MapperFeature' for property 'null'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [com.fasterxml.jackson.databind.MapperFeature] for value 'accept-case-insensitive-properties'; nested exception is java.lang.IllegalArgumentException: No enum constant com.fasterxml.jackson.databind.MapperFeature.accept-case-insensitive-properties


Action:

Update your application's configuration

The same app, started with user.language=en (tried some other languages as well) works fine. Seems like any Spring Boot application (even freshly generated, like the one in attached zip) is affected.

springboot-localebugdemo.zip

[danbar74]

@snicoll Tested, works as expected now, thank you.

[philwebb]

Reopening to see if we can add a test for this (might not be possible)