ConditionalOnClass (HateoasProperties.class) in SpringDocHateoasConfiguration

[seregamorph]

Problem statement

SpringDocHateoasConfiguration auto-configurations fails in case of combination when org.springframework.hateoas:spring-hateoas is present in the classpath (checked via existing @ConditionalOnClass(LinkRelationProvider.class)), but org.springframework.boot.hateoas.autoconfigure.HateoasProperties from org.springframework.boot:spring-boot-hateoas (since 4.0.x) is not on the classpath.

The failure is

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 
'hateoasHalProvider' defined in class path resource [org/springdoc/core/configuration/SpringDocHateoasConfiguration.class]: 
Unexpected exception during bean creation
...
Caused by: java.lang.TypeNotPresentException: Type org.springframework.boot.hateoas.autoconfigure.HateoasProperties not present
...
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.hateoas.autoconfigure.HateoasProperties

Proposed solution

Add missing @ConditionalOnClass(HateoasProperties.class)