Tim Nachreiner

can you post the jsp code?
What happens when you click 'Submit'?

Nice example here:

don't show example

Here is how I did it.  I think you are missing @ModelAttribute

public String saveInitialRequest(@Valid @ModelAttribute("initialRequest") InitialRequestDto initialRequestDto, BindingResult result, Model model) throws Exception {

Years ago I saw a Thymeleaf demo that threw the White Label error because an html tag wasn't properly closed.  Thymeleaf is really picky about that.  I see you don't have a closing Form tag.  Try adding one; and also check to make sure every element has a closing tag.

All your datasources will be created when the app first loads, via component scan.  You just won't be able to 'open' the secondary datasource until you get the credentials from the first datasource.

I was taught that the bindingResult parameter should always follow the parameter annotated with @Valid.  Might want to swap the order of your last two parameters.

Probably not a good idea to make your Bean ID with spaces in it: jsp view resolver.   Try making it one word: view-resolver or viewresolver.

This might help:  https://howtodoinjava.com/spring-core/send-email-with-spring-javamailsenderimpl-example/

This link may be of interest to you, especially item 4:    https://www.baeldung.com/spring-postconstruct-predestroy

Can you run your unit tests without this "extra" .xml file?
Sometimes a different .xml file is created for unit testing.

I'm assuming you have an architecture like this: TodoController ==> TodoService ==> TodoDao.
If so, TodoController should handle all CRUD operations on your Todo entity.  Why would you have another controller that performs CRUD operations on the Todo entity?

If you DID have another controller that performed CRUD operations on the Todo entity, that controller could still use the TodoService and TodoDao layers; eliminating the need for duplicate code.

I get the feeling you are looking for a 'Spring-based' solution to your problem in order to learn Spring, but based on your requirements, a database trigger on the Todo table may be more appropriate.

try  return employeeRepository.findById(id).orElse(null);

This link should answer your question:

https://stackoverflow.com/questions/49561425/cant-use-findone-in-my-code-with-jparepository#

What tool are you using to develop the Angular piece?

I viewed your source code and was impressed.
Is this a tutorial you are following?
If so, would you share the link?