CLI Task: validate-mapping

There should be a CLI task "validate-mapping" or similar that reads in the metadata of all configured, mapped classes and processes them one-by-one, looking for errors in the mapping. For example, it is easy to detect that way when there is an association mapped with mappedBy but the other side does not have inversedBy specified (or there is not even another side...) . We can not make such strict validations during runtime for performance reasons, so a specific CLI task can be a great help during development for troubleshooting.