Tests build fails because of WebTestClientAutoConfiguration with Spring 4.0.0-M1 and WebMvcTest

[Germainch]

Hello, I just upgraded Spring Boot's version from 3.5.4 to 4.0.0-M1 in my project and tests build failed with this stack trace:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springBootWebTestClientBuilderCustomizer' defined in class path resource [org/springframework/boot/test/autoconfigure/web/reactive/WebTestClientAutoConfiguration.class]
.
.
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Caused by: java.lang.TypeNotPresentException: Type org.springframework.boot.http.codec.CodecCustomizer not present

My dependencies:

• spring-boot-starter-test
• spring-boot-starter-webmvc
• spring-boot-starter-security

I managed to bypass this error and by adding 'excludeAutoConfiguration = org.springframework.boot.test.autoconfigure.web.reactive.WebTestClientAutoConfiguration.class'
in my @WebMvcTest annotation.

[snicoll]

Thanks for the report, but creating a project with the dependencies you've listed doesn't generate such problem for me. Rather than describing your setup, please share a small sample we can run ourselves.

[Germainch]

I can't reproduce the error easily either, I must have misconfiguration somewhere i don't see on my project. I'll try to reproduce the issue on a sample project and share it here if i succeed