return DocumentUtil.getValue(attributes, "email", String.class);
    }

    /**
     * Gets the user groups.
     *
     * @return the user groups
     */
    public String[] getUserGroups() {
        String[] userGroups = DocumentUtil.getValue(attributes, "groups", String[].class);
        if (userGroups == null) {
            userGroups = getDefaultGroupsAsArray();
        }
        return userGroups;

        OpenIdConnectCredential credential = new OpenIdConnectCredential(attributes);
        assertEquals("******@****.***", credential.getUserId());
        assertArrayEquals(new String[] { "group1", "group2" }, credential.getUserGroups());
    }