public void test_throwAndCatch() {
        // Test throwing and catching the exception
        String username = "nonexistentuser";

        try {
            throw new FessUserNotFoundException(username);
        } catch (FessUserNotFoundException e) {
            assertEquals("User is not found: nonexistentuser", e.getMessage());
            assertNull(e.getCause());
        } catch (Exception e) {

					return nil, err
				}
				nonExistentUsers = append(nonExistentUsers, ndn.String())
				continue
			}
			return nil, err
		}
		if len(searchResult.Entries) == 0 {
			// DN was not found - this means this user account is
			// expired.
			ndn, err := ldap.ParseDN(dn)
			if err != nil {
				return nil, err
			}
			nonExistentUsers = append(nonExistentUsers, ndn.String())
		}
	}