SpringApplicationBuilder: Initialize siblings concurrently

[OLibutzki]

The SpringApplicationBuilder supports the creation of hierarchical application contexts. Those contexts are initialized sequentially. In order to accelerate the startup time, siblings can be initialized concurrently.

It would be great to extend the SpringApplicationBuilder-API to support concurrent initialization.

[philwebb]

Thanks for the suggestion but I think this would add quite a lot of complexity to the builder. I'm also not sure how much of a benefit this would be for typical Spring Boot applications which tend to only have one a single application context.

[OLibutzki]

Ok, thanks for the response. I'm going to solve this in our project locally.