<customfield id="customfield_10730" key="com.atlassian.jira.plugin.system.customfieldtypes:multiselect">
    <customfieldname>Environnements</customfieldname>
        <customfieldvalues>
            <customfieldvalue key="13044">
                <![CDATA[ DATAOBJECT]]>
            </customfieldvalue>
        </customfieldvalues>
</customfield>

JiraRestClientFactory restClientFactory = new AsynchronousJiraRestClientFactory();
try {

    JiraRestClient restClient = restClientFactory.createWithBasicHttpAuthentication(new URI("http://JIRA_DOMAIN"), "Username", "Passwd");
    IssueRestClient i = restClient.getIssueClient();
    IssueInputBuilder issueBuilder = new IssueInputBuilder("projectKey", issueTypeID));
    issueBuilder.setSummary("description");
    issueBuilder.setFieldValue("customfield_10730", "DATAOBJECT");
    IssueInput issue = issueBuilder.build();

    Promise<BasicIssue> promise = i.createIssue(issue);
    try
    {
        BasicIssue basicIssue = promise.get();
        System.out.println(basicIssue.getId());
        restClient.close();
    }
    catch (Exception e)
    {
        System.out.println(e.getMessage());
    }

}
catch (URISyntaxException e)
{
    System.out.println(e.getMessage());
}