java - RestTemplate Exchange with target class as Nested Map and Lists

Question

I have a Rest Template exchange for get service. The service returns the responses as below :

Response1(Single Document):- { "irpage": [{ "drawer": "HPPS", "folderNumber": "HPA00008047642", "docID": "1", "pageNumber": "1", "din": "HPPSHPA00008047642000001", "userKey1": "20151119NJ", "docType": "APPD", "docDate": "20151119", "numberPages": "1", "fileName": "\12_HPPS\20151119\5_Z000\SCHEDL2\952490010845", "tempFileName": "\\prcins.net\Shared\irtestnjimages01\12_HPPS\20151119\5_Z000\SCHEDL2\952490010845.pdf", "driver": "", "dateCaptured": "20151119", "timeCaptured": "08:45:04", "singleInd": "S", "userID": "SCHEDL2", "status": "U", "batch": "Z000", "format": "PDF", "media": "D", "orientation": "0", "tempDin": "12201511190845952490845SCHEDL2", "transType": "APPD", "operator": "", "userkey2": "0", "reason": "Computer Generated Document", "archiveStatus": "A", "archiveDate": "20151119", "deviceID": "1", "packageID": "1", "packageType": "15007", "markedInd": "0", "dspPageNumber": "1", "aMedia": "", "aDrive": "", "description": "Output", "folderName": "GAIL BARTLING", "docDescription": "Application Document", "overlayID": null, "docIndex": null }] }

Response2(Multiple Documents): { "irpage": [{ "drawer": "HPPS", "folderNumber": "HPA00008047642", "docID": "1", "pageNumber": "1", "din": "HPPSHPA00008047642000001", "userKey1": "20151119NJ", "docType": "APPD", "docDate": "20151119", "numberPages": "1", "fileName": "\12_HPPS\20151119\5_Z000\SCHEDL2\952490010845", "tempFileName": "\\prcins.net\Shared\irtestnjimages01\12_HPPS\20151119\5_Z000\SCHEDL2\952490010845.pdf", "driver": "", "dateCaptured": "20151119", "timeCaptured": "08:45:04", "singleInd": "S", "userID": "SCHEDL2", "status": "U", "batch": "Z000", "format": "PDF", "media": "D", "orientation": "0", "tempDin": "12201511190845952490845SCHEDL2", "transType": "APPD", "operator": "", "userkey2": "0", "reason": "Computer Generated Document", "archiveStatus": "A", "archiveDate": "20151119", "deviceID": "1", "packageID": "1", "packageType": "15007", "markedInd": "0", "dspPageNumber": "1", "aMedia": "", "aDrive": "", "description": "Output", "folderName": "GAIL BARTLING", "docDescription": "Application Document", "overlayID": null, "docIndex": null }, { "drawer": "HPPS", "folderNumber": "HPA00008047642", "docID": "4", "pageNumber": "1", "din": "HPPSHPA00008047642000004", "userKey1": "20160104NJ", "docType": "FINA", "docDate": "20160104", "numberPages": "1", "fileName": "\12_HPPS\20160105\5_Z000\SCHEDL2\308070010819", "tempFileName": "\\prcins.net\Shared\irtestnjimages01\12_HPPS\20160105\5_Z000\SCHEDL2\308070010819.pdf", "driver": "", "dateCaptured": "20160105", "timeCaptured": "08:19:30", "singleInd": "S", "userID": "SCHEDL2", "status": "U", "batch": "Z000", "format": "PDF", "media": "D", "orientation": "0", "tempDin": "12201601050819308070819SCHEDL2", "transType": "FINA", "operator": "", "userkey2": "0", "reason": "Computer Generated Document", "archiveStatus": "A", "archiveDate": "20160105", "deviceID": "1", "packageID": "4", "packageType": "15007", "markedInd": "0", "dspPageNumber": "1", "aMedia": "", "aDrive": "", "description": "Output", "folderName": "GAIL BARTLING", "docDescription": "Final Notice of Cancellation", "overlayID": null, "docIndex": null }] }

When I provide the Class < E > targetClass as new HashMap< String, List< Map < String , String>>>().getClass() the Response2 get parsed and I get the results in a Map, however the response1(Single Document) doesn't work and returns as null.

or If I provide the Class < E > targetClass as new HashMap< String , Map < String, String>>().getClass() the Response1 get parsed and I get the results in a Map, however the response2(Multiple Documents) doesn't work and returns as null.

I am not sure how to handle and parse the both the responses from service ?

responseMap =  restUtils.findDocuments(urlBuilder.build(),new HashMap<String,List<Map<String,String>>>().getClass());


**RestUtils Class:** 
public <E> E findDocuments(String url,Class<E> targetClass) throws JsonProcessingException {

    MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
    headers.add(ACCEPT, MediaType.APPLICATION_JSON_VALUE);
    headers.add(CONTENT_TYPE,MediaType.APPLICATION_JSON_VALUE);
    //headers.add("id", StringUtils.trimToEmpty(policyNo));
    HttpEntity<Object> requestEntity = new HttpEntity<Object>(headers);
    ResponseEntity<E> response = restTemplate.exchange(url,HttpMethod.GET, requestEntity, targetClass);
    ObjectMapper mapper = new ObjectMapper();
    String jsonResponse = mapper.writeValueAsString(response); 
    System.out.println(jsonResponse);

    return (E) response.getBody();
}

Any help will be appreciated.

Don't know how to format json on SO editor, tried to put in a formatted Json but it make a mess of it — Sanjeev
– Sanjeev, Commented Mar 12, 2016 at 4:10

Lenar · Accepted Answer · 2016-03-12 04:50:56Z

Response1(Single Document):-

{  
 "irpage":[  
  {  
     "drawer":"HPPS",
     "folderNumber":"HPA00008047642",
     "docID":"1",
     "pageNumber":"1",
     "din":"HPPSHPA00008047642000001",
     "userKey1":"20151119NJ",
     "docType":"APPD",
     "docDate":"20151119",
     "numberPages":"1",
     "fileName":"\12_HPPS\20151119\5_Z000\SCHEDL2\952490010845",
     "tempFileName":"\\prcins.net\Shared\irtestnjimages01\12_HPPS\20151119\5_Z000\SCHEDL2\952490010845.pdf",
     "driver":"",
     "dateCaptured":"20151119",
     "timeCaptured":"08:45:04",
     "singleInd":"S",
     "userID":"SCHEDL2",
     "status":"U",
     "batch":"Z000",
     "format":"PDF",
     "media":"D",
     "orientation":"0",
     "tempDin":"12201511190845952490845SCHEDL2",
     "transType":"APPD",
     "operator":"",
     "userkey2":"0",
     "reason":"Computer Generated Document",
     "archiveStatus":"A",
     "archiveDate":"20151119",
     "deviceID":"1",
     "packageID":"1",
     "packageType":"15007",
     "markedInd":"0",
     "dspPageNumber":"1",
     "aMedia":"",
     "aDrive":"",
     "description":"Output",
     "folderName":"GAIL BARTLING",
     "docDescription":"Application Document",
     "overlayID":null,
     "docIndex":null
  }
 ]
}

Response2(Multiple Documents)

{  
 "irpage":[  
  {  
     "drawer":"HPPS",
     "folderNumber":"HPA00008047642",
     "docID":"1",
     "pageNumber":"1",
     "din":"HPPSHPA00008047642000001",
     "userKey1":"20151119NJ",
     "docType":"APPD",
     "docDate":"20151119",
     "numberPages":"1",
     "fileName":"\12_HPPS\20151119\5_Z000\SCHEDL2\952490010845",
     "tempFileName":"\\prcins.net\Shared\irtestnjimages01\12_HPPS\20151119\5_Z000\SCHEDL2\952490010845.pdf",
     "driver":"",
     "dateCaptured":"20151119",
     "timeCaptured":"08:45:04",
     "singleInd":"S",
     "userID":"SCHEDL2",
     "status":"U",
     "batch":"Z000",
     "format":"PDF",
     "media":"D",
     "orientation":"0",
     "tempDin":"12201511190845952490845SCHEDL2",
     "transType":"APPD",
     "operator":"",
     "userkey2":"0",
     "reason":"Computer Generated Document",
     "archiveStatus":"A",
     "archiveDate":"20151119",
     "deviceID":"1",
     "packageID":"1",
     "packageType":"15007",
     "markedInd":"0",
     "dspPageNumber":"1",
     "aMedia":"",
     "aDrive":"",
     "description":"Output",
     "folderName":"GAIL BARTLING",
     "docDescription":"Application Document",
     "overlayID":null,
     "docIndex":null
  },
  {  
     "drawer":"HPPS",
     "folderNumber":"HPA00008047642",
     "docID":"4",
     "pageNumber":"1",
     "din":"HPPSHPA00008047642000004",
     "userKey1":"20160104NJ",
     "docType":"FINA",
     "docDate":"20160104",
     "numberPages":"1",
     "fileName":"\12_HPPS\20160105\5_Z000\SCHEDL2\308070010819",
     "tempFileName":"\\prcins.net\Shared\irtestnjimages01\12_HPPS\20160105\5_Z000\SCHEDL2\308070010819.pdf",
     "driver":"",
     "dateCaptured":"20160105",
     "timeCaptured":"08:19:30",
     "singleInd":"S",
     "userID":"SCHEDL2",
     "status":"U",
     "batch":"Z000",
     "format":"PDF",
     "media":"D",
     "orientation":"0",
     "tempDin":"12201601050819308070819SCHEDL2",
     "transType":"FINA",
     "operator":"",
     "userkey2":"0",
     "reason":"Computer Generated Document",
     "archiveStatus":"A",
     "archiveDate":"20160105",
     "deviceID":"1",
     "packageID":"4",
     "packageType":"15007",
     "markedInd":"0",
     "dspPageNumber":"1",
     "aMedia":"",
     "aDrive":"",
     "description":"Output",
     "folderName":"GAIL BARTLING",
     "docDescription":"Final Notice of Cancellation",
     "overlayID":null,
     "docIndex":null
  }
 ]
}

I'd solve it this way

        Gson gson = new GsonBuilder().create();
        responseObject = gson.fromJson(jsonString, MyClass.class);

MyClass

public class MyClass {
    List<ArrayEntry> irpage;

    public class ArrayEntry {
        String drawer;
        String folderNumber;
        ...
    }
}

Use modifiers that you need (public/private)

Maven dependency for Gson

    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.4</version>
    </dependency>

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