BasicAuthenticator from jersey-client library currently only checks the first value of WWW-Authentication header:

final String authenticate = response.getHeaders().getFirst(HttpHeaders.WWW_AUTHENTICATE);

Which means that if a server returned multiple WWW-Authenticate headers (say, for Basic & Bearer authentication methods), and Basic IS in that list, but IS NOT the first value, which might be the case, then BasicAuthenticator will fail to do its job.
This ticket is to make BasicAuthenticator honor the case above by checking all of the WWW-Authenticate values (to pick the one that starts with Basic).