SpringBoot Spring Data found 0 R2DBC repositories when mongodb-reactive starter is added to project

After adding

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
        </dependency>

to project with spring-boot-starter-data-r2dbc spring data failes to find R2DBC repositories

Spring boot version 3.1.3

Steps to reproduce 1. Fetch guide repo https://github.com/spring-guides/gs-accessing-data-r2dbc 2. Add dependency

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
        </dependency>

1. Try to run app

Comment From: wilkinsona

An INFO message is logged that explains what is happening and what to do:

2023-11-07T15:19:08.454Z  INFO 11869 --- [           main] .RepositoryConfigurationExtensionSupport : Spring Data R2DBC - Could not safely identify store assignment for repository candidate interface com.example.accessingdatar2dbc.CustomerRepository; If you want this repository to be a R2DBC repository, consider annotating your entities with one of these annotations: org.springframework.data.relational.core.mapping.Table (preferred), or consider extending one of the following types with your repository: org.springframework.data.r2dbc.repository.R2dbcRepository

Adding recommended @Table to the Customer entity fixes the problem.

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