How to customize Jackson ObjectMapper with Spring application.properties?

Question

I want to enable the following jackson mapper feature: MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES

According to https://docs.spring.io/spring-boot/docs/current/reference/html/howto-spring-mvc.html:

Could be configured in application.properties as follows: spring.jackson.mapper.accept_case_insensitive_properties=true

But:

@RestController public class MyServlet { @RequestMapping("/test") public void test(@Valid TestReq req) { } } public class TestReq { @NotBlank private String name; }

Usage:

localhost:8080/test?name=test //works localhost:8080/test?Name=test //fails with 'name may not be blank'

So, the case insensitive property is not taken into account. But why?

By the way: even using Jackson2ObjectMapperBuilderCustomizer explicit does not work:

@Bean public Jackson2ObjectMapperBuilderCustomizer initJackson() { Jackson2ObjectMapperBuilderCustomizer c = new Jackson2ObjectMapperBuilderCustomizer() { @Override public void customize(Jackson2ObjectMapperBuilder builder) { builder.featuresToEnable(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES); } }; return c; }

spring-boot-1.5.3.RELEASE

Where are you creating the ObjectMapper instance, in a java class file or in the spring config? — Richard
– Richard, Commented Jun 6, 2017 at 10:36
It is automatically created by spring-boot or spring-mvc, and should thereby use the configuration properties during initialization. — membersound
– membersound, Commented Jun 6, 2017 at 10:45
What you are trying is data binding which does nothing with Jackson. You are passing URL parameters whereas the Jackson serializer/mapper will only be active for response bodies NOT parameters. — M. Deinum
– M. Deinum, Commented Jun 6, 2017 at 11:38

andyf · Accepted Answer · 2018-10-02 04:37:56Z

According to spring doc you can customize it.

I fix this problem by set my application.yml like this(spring 2.0):

 spring: jackson: mapper: ACCEPT_CASE_INSENSITIVE_PROPERTIES: true

Did you tried change your setting accept_case_insensitive_properties to UPPER CASE？

Also you can keep output to Upper Case by setting like this:

 jackson: mapper: ACCEPT_CASE_INSENSITIVE_PROPERTIES: true property-naming-strategy: com.fasterxml.jackson.databind.PropertyNamingStrategy.PascalCaseStrategy

Note that PascalCaseStrategy was deprecated now, but still working.

Current version of spring/spring-boot uses spring.jackson.mapper.accept-case-insensitive-properties=true (hyphens not underscores for the property name; not sure if case-sensitive or not).

membersound · Accepted Answer · 2017-06-08 14:34:12Z

Simple answer: it is not possible.

The Jackson2ObjectMapperBuilderCustomizer affects the JSON POST requests only. It has no effect on the get query binding.

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