in src/main/java/org/apache/sling/auth/xing/oauth/impl/DefaultXingOauthUserManager.java [170:180]
private boolean updateUserProperty(final User user, final ValueFactory valueFactory, final String property, final String string) throws RepositoryException {
final Value[] values = user.getProperty(property);
if (values != null && values.length > 0) {
if (string.equals(values[0].getString())) {
return false;
}
}
final Value value = valueFactory.createValue(string);
user.setProperty(property, value);
return true;
}