[
    {
        "self": "http://localhost:8090/jira/rest/api/2.0/issueType/3",
        "id": "3",
        "name": "Task",
        "subtask": false,
        "statuses": [
            {
                "self": "http://localhost:8090/jira/rest/api/2.0/status/10000",
                "description": "The issue is currently being worked on.",
                "iconUrl": "http://localhost:8090/jira/images/icons/progress.gif",
                "name": "In Progress",
                "id": "10000"
            },
            {
                "self": "http://localhost:8090/jira/rest/api/2.0/status/5",
                "description": "The issue is closed.",
                "iconUrl": "http://localhost:8090/jira/images/icons/closed.gif",
                "name": "Closed",
                "id": "5"
            }
        ]
    }
]

public void changeStatus(IssueRestClient iRestClient,
        List<Statuses> JiraStatuses, String key) {
    String status = "To Do";
    for (Statuses statuses : vOneToJiraStatuses) {
        if (1 == statuses.compareTo(status)) {
            try {
                String _transition = statuses.getTransition();
                Issue issue = iRestClient.getIssue(key).get();
                Transition transition = getTransition(iRestClient, issue,
                        _transition);
                if (!(isBlankOrNull(transition))) {

                    if (!(issue.getStatus().getName()
                            .equalsIgnoreCase(_transition)))
                        transition(transition, issue, null, iRestClient,
                                status);
                }
            } catch (Exception e) {
                Constants.ERROR.info(Level.INFO, e);

            }
            break;
        }
    }

}

private void transition(Transition transition, Issue issue,
        FieldInput fieldInput, IssueRestClient issueRestClient,
        String status) throws Exception {

    if (isBlankOrNull(fieldInput)) {
        TransitionInput transitionInput = new TransitionInput(
                transition.getId());

                issueRestClient.transition(issue, transitionInput).claim();
        Constants.REPORT.info("Status Updated for : " + issue.getKey());
    } else {
        TransitionInput transitionInput = new TransitionInput(
                transition.getId());
        issueRestClient.transition(issue, transitionInput).claim();
        Constants.REPORT.info("Status Updated for : " + issue.getKey());

    }
}

public Transition getTransition(IssueRestClient issueRestClient,
        Issue issue, String _transition) {

        Promise<Iterable<Transition>> ptransitions = issueRestClient
            .getTransitions(issue);
    Iterable<Transition> transitions = ptransitions.claim();
    for (Transition transition : transitions) {

        if (transition.getName().equalsIgnoreCase(_transition)) {
            return transition;
        }
    }
    return null;
}

/rest/api/2/issue/${issueIdOrKey}/transitions