How to parse issuetype REST call return value?

[Matthias Küspert]

While developing an Atlassian Connect Cloud plugin I try to parse the return value of rest/api/2/issuetype into JSON objects to take advantage of the JRJC IssueTypeJsonParser.

What I tried so far:

ResponseEntity<String> response1 = template.getForEntity(baseUrl + JIRA_REST_BASE_PATH + "issuetype",
                                                            String.class);
LOG.info("Issuetypes response 1 is: {}", response1.getBody());
//
ResponseEntity<Object[]> response2 = template.getForEntity(baseUrl + JIRA_REST_BASE_PATH + "issuetype",
                                                           Object[].class);
Object[] issueTypes2 = response2.getBody();
LOG.info("Issuetype response 2: size = {}, objects = {}", issueTypes2.length, issueTypes2);
//
ResponseEntity<JSONObject[]> response3 = template.getForEntity(baseUrl + JIRA_REST_BASE_PATH + "issuetype",
                                                           JSONObject[].class);
JSONObject[] issueTypes3 = response3.getBody();
LOG.info("Issuetype response 3: size = {}, objects = {}", issueTypes3.length, issueTypes3);
//
ResponseEntity<JSONArray> response4 = template.getForEntity(baseUrl + JIRA_REST_BASE_PATH + "issuetype",
                                                          JSONArray.class);
JSONArray issueTypes4 = response4.getBody();
LOG.info("Issuetype response 4: size = {}, objects = {}", issueTypes4.length(), issueTypes4);

The results are:

Issuetypes response 1 is: [{"self":"https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10001","id":"10001","description":"An improvement or enhancement to an existing feature or task.","iconUrl":"https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10310&avatarType=issuetype","name":"Improvement","subtask":false,"avatarId":10310},{"self":"https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10004","id":"10004","description":"A new feature of the product, which has yet to be developed.","iconUrl":"https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10311&avatarType=issuetype","name":"New Feature","subtask":false,"avatarId":10311},{"self":"https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10005","id":"10005","description":"A problem which impairs or prevents the functions of the product.","iconUrl":"https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10303&avatarType=issuetype","name":"Bug","subtask":false,"avatarId":10303},{"self":"https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10002","id":"10002","description":"A task that needs to be done.","iconUrl":"https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10318&avatarType=issuetype","name":"Task","subtask":false,"avatarId":10318},{"self":"https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10000","id":"10000","description":"A big user story that needs to be broken down. Created by JIRA Software - do not edit or delete.","iconUrl":"https://kuespert-dev.atlassian.net/images/icons/issuetypes/epic.svg","name":"Epic","subtask":false},{"self":"https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10003","id":"10003","description":"The sub-task of the issue","iconUrl":"https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10316&avatarType=issuetype","name":"Sub-task","subtask":true,"avatarId":10316}]

Issuetype response 2: size = 6, objects = [{self=https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10001, id=10001, description=An improvement or enhancement to an existing feature or task., iconUrl=https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10310&avatarType=issuetype, name=Improvement, subtask=false, avatarId=10310}, {self=https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10004, id=10004, description=A new feature of the product, which has yet to be developed., iconUrl=https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10311&avatarType=issuetype, name=New Feature, subtask=false, avatarId=10311}, {self=https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10005, id=10005, description=A problem which impairs or prevents the functions of the product., iconUrl=https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10303&avatarType=issuetype, name=Bug, subtask=false, avatarId=10303}, {self=https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10002, id=10002, description=A task that needs to be done., iconUrl=https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10318&avatarType=issuetype, name=Task, subtask=false, avatarId=10318}, {self=https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10000, id=10000, description=A big user story that needs to be broken down. Created by JIRA Software - do not edit or delete., iconUrl=https://kuespert-dev.atlassian.net/images/icons/issuetypes/epic.svg, name=Epic, subtask=false}, {self=https://kuespert-dev.atlassian.net/rest/api/2/issuetype/10003, id=10003, description=The sub-task of the issue, iconUrl=https://kuespert-dev.atlassian.net/secure/viewavatar?size=xsmall&avatarId=10316&avatarType=issuetype, name=Sub-task, subtask=true, avatarId=10316}]

Issuetype response 3: size = 6, objects = [{}, {}, {}, {}, {}, {}]

and for 4th try:

Caught org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Can not deserialize instance of org.codehaus.jettison.json.JSONArray out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of org.codehaus.jettison.json.JSONArray out of START_ARRAY token
 at [Source: java.io.PushbackInputStream@5aaae78e; line: 1, column: 1]

org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Can not deserialize instance of org.codehaus.jettison.json.JSONArray out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of org.codehaus.jettison.json.JSONArray out of START_ARRAY token
 at [Source: java.io.PushbackInputStream@5aaae78e; line: 1, column: 1]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:244) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:229) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:96) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:917) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:901) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:655) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]
    at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:312) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE]

None of the returned values can be used to invoke

IssueTypeJsonParser parser = new IssueTypeJsonParser();
IssueType issueType = parser.parse(someObject);

How can I parse the result from the

<JIRA-BASE-URL>/rest/api/2/issuetype

REST call to get some object to work with?

What's puzzeling me is that the String response (1) contains quotes while the Object[] response doesn't.

Also the JSONObject[] response returns the correct number of entries but they are empty.

And the 4th try - which IMHO is the most elegant - throws an exception.

What's going wrong?

[Matthias Küspert · Accepted solution]

This is how it works for me now:

ResponseEntity<String> response = template.getForEntity(baseUrl + JIRA_REST_BASE_PATH + "issuetype",
                                                        String.class);
Collection<IssueType> result = JsonParseUtil.parseJsonArray(new JSONArray(response.getBody()), new IssueTypeJsonParser());
for (IssueType type : result) {
 LOG.info("Issuetype name = " + type.getName());
}