H2 retrieve Spring Security user credentials anywhere in the code

Code snippet to retrieve user credentials anywhere in the code:


SecurityContextHolder
  .setStrategyName(SecurityContextHolder
    .MODE_INHERITABLETHREADLOCAL);
Object principal = SecurityContextHolder
  .getContext().getAuthentication()
    .getPrincipal();


principal is then to be cast to the implementation returned by


MyImplementationOfUserDetailsService
    .loadUserByUsername(final String username)