@Override public Authentication authenticate(Authentication authentication) throws AuthenticationException { KeycloakAuthenticationToken token = (KeycloakAuthenticationToken) super.authenticate(authentication); String username; UserDetails userDetails; if (token == null) { return null; } username = this.resolveUsername(token); userDetails = userDetailsService.loadUserByUsername(username); return new KeycloakUserDetailsAuthenticationToken( userDetails, token.getAccount(), token.getAuthorities()); }