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Description
AbstractUserDetailsAuthenticationProvider catches UsernameNotFoundException, but does not include it when throwing BadCredentialsException.
Debugging would be improved if the stack trace included the original issue. This can be achieved by including the exception in the BadCredentialsException construction:
// ...
} catch (UsernameNotFoundException ex) {
// ...
String message = this.messages
.getMessage("AbstractUserDetailsAuthenticationProvider.badCredentials", "Bad credentials")
throw new BadCredentialsException(message, ex);
}