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The issue with the failure of introspection of the class, [org.springframework.web.reactive.config.DelegatingWebFluxConfiguration], can be resolved in several ways:

1. Upgrade the Spring Framework version to the latest available version.
2. Check if all necessary dependencies are included in the project and update them if required.

3. Try excluding the problematic class from the component scanning process. This can be done by adding the following line to the Spring Boot application class:

   @ComponentScan(excludeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = DelegatingWebFluxConfiguration.class))

4. If none of the above solutions work, try creating a custom configuration class that extends DelegatingWebFluxConfiguration and override its methods to fix the issue.

Note: It's important to identify the root cause of the issue before implementing any of these solutions. It may require checking the error logs or seeking help from the Spring Framework community.