In PHP & Symfony world there is a tool called Sonata Admin https://sonata-project.org/ based on AdminLTE template, that is all-in-one admin tool with login, menu configurati
https://www.javatpoint.com/spring-mvc-crud-example contains an example of how to create a Spring MVC CRUD there are plenty more examples of various spring project (This particular falls under Spring MVC).
This is not a ready-made CRUD, but a way how you could quickly implement one. https://spring.io/guides/gs/crud-with-vaadin/ is also worth checking.
Although there are few project like spring batch admin (For batch administration), or Spring boot admin (Monitoring spring boot applications), which provides a UI, mainly spring project provides a simple programmatically way of plugging in what's needed.
It's a plug & play kind of framework which targets various aspects of an enterprise application. Chances of finding a ready-made UI app would be more on GitHub rather than a specific spring plugin.