private DirContextOperations bindWithDn(String userDnStr, String username, String password) {
BaseLdapPathContextSource ctxSource = (BaseLdapPathContextSource) getContextSource();
DistinguishedName userDn = new DistinguishedName(userDnStr);
DistinguishedName fullDn = new DistinguishedName(userDn);
fullDn.prepend(ctxSource.getBaseLdapPath());
logger.debug("Attempting to bind as " + fullDn);
DirContext ctx = null;
try {