AuthenticationManager throws StackOverflowError: null when just creating another class that implements AuthenticationProvider

It looks like the authenticate method in your UserPassAuthProvider class is calling itself indefinitely, causing a StackOverflowError. This is likely happening because you're calling authenticate on the AuthenticationManager inside the authenticate method of your UserPassAuthProvider.

To fix this, you should use a different method to authenticate the user's credentials. Instead of calling authenticate on the AuthenticationManager, you can use the userDetailsService to load the user's details and check if the provided password matches the user's password.

Here's an example of how you could update the authenticate method in your UserPassAuthProvider class to fix this issue:

@Override
public UserPassAuthToken authenticate(Authentication authentication) throws AuthenticationException {
    String username = authentication.getName();
    String password = (String) authentication.getCredentials();

    UsersDetails user = userDetailsService.loadUserByUsername(username);
    if (user != null && passwordEncoder.matches(password, user.getPassword())) {
        return new UserPassAuthToken(user, password, user.getAuthorities());
    } else {
        throw new BadCredentialsException("Invalid username or password");
    }
}

This code first uses the userDetailsService to load the user's details based on the provided username. Then, it checks if the provided password matches the user's password. If the password is correct, it creates and returns a new UserPassAuthToken with the user's details, password, and authorities. Otherwise, it throws a BadCredentialsException.

I hope this helps! Let me know if you have any other questions.

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