D-Net

    public boolean isZombieUsersEmail(String email) throws Exception{

        LDAPConnection connection = ldapConnector.getConnection();

        try {

            logger.debug("checking if zombie user " + email + " exists in ldap");

            Filter filter = Filter.createEqualityFilter("mail", email);

            SearchRequest searchRequest = new SearchRequest(ldapConnector.getZombiesDN(), SearchScope.SUB, filter, "mail");

            SearchResult searchResult = connection.search(searchRequest);

            if (!searchResult.getSearchEntries().isEmpty()) {

                logger.info("Zombie user with email: " + email + " exists!");

                return true;

            } else {

                return false;

            }

        } catch (Exception e) {

            logger.error("Fail to check if zombie user email exists.", e);

            throw e;

        } finally {

            if (connection != null)

                connection.close();

        }

    }

    public boolean isZombieUsersUsername(String username) throws Exception {

        LDAPConnection connection = ldapConnector.getConnection();

        try {

            logger.debug("checking if zombie user " + username + " exists in ldap");

            Filter filter = Filter.createEqualityFilter("uid", username);

            SearchRequest searchRequest = new SearchRequest(ldapConnector.getZombiesDN(), SearchScope.SUB, filter, "uid");

            SearchResult searchResult = connection.search(searchRequest);

            if (!searchResult.getSearchEntries().isEmpty()) {

                logger.info("Zombie user with username: " + username + " exists!");

                return true;

            } else {

                return false;

            }

        } catch (Exception e) {

            logger.error("Fail to check if zombie username exists.", e);

            throw e;

        } finally {

            if (connection != null)

                connection.close();

        }

    }