title: edit LDAP Photo attribute, spring-ldap InvalidAttributeValueException
body: <p>I develop an LDAP interface program which can modify person attributes, but when I try to modify the value of the photo attribute with an url string, I have this exception : </p>
  
  <blockquote>
    <p>org.springframework.ldap.InvalidAttributeValueException: [LDAP: error code 21 - photo: no validator for syntax 1.3.6.1.4.1.1466.115.121.1.23];</p>
  </blockquote>
  
  <p>I think I must send a JPG photo file to ldap but I don't know how to do it...</p>
  
  <p>Anyone has an idea?</p>