Requested bean is currently in creation: Is there an unresolvable circular reference?

This error message is usually caused by a circular dependency between beans in Spring framework. It means that two or more beans are referring to each other directly or indirectly, which creates a circular reference and causes Spring to fail to construct the beans.

To solve this issue, you can try one or more of the following:

1. Refactor your code to remove the circular dependency between beans.
2. Use setter-based injection instead of constructor-based injection.
3. Use @Lazy annotation to delay the initialization of one of the beans.
4. Use @Autowired with @Qualifier to specify which bean to inject.

It's important to note that circular dependencies could indicate a design flaw or a violation of the Single Responsibility Principle, so it's always recommended to review your code and make sure that the circular dependency is really necessary before trying to solve it.