I have an object that I need to upload in JSON

public class Contribution<T extends MovieRequest> { private Set<T> elementsToAdd; private Map<Long, T> elementsToUpdate; private Set<Long> idsToDelete;
}

I want to send this object in JSON using swagger

{ "elementsToAdd": [ { "country": "USA", "title": "string" } ], "elementsToUpdate": {}, "numbersToDelete": [ 0 ]
}

I do not know how to put an object in "elementsToUpdate": {},. As a key I want to put Long, and int he value put object.

key (Long), value (object)

I tried this way

 "elementsToUpdate": { { 1 : { "country": "USA", "title": "string" } } }

but throws the error

JSON parse error: Unexpected character ('{' (code 123)): was expecting double-quote to start field name

3

2 Answers

1. Key always should be string.
2. Why it still doesn't work? Because the error is caused by the redundant brace inside of "elementsToUpdate". Below is an example:

"elementsToUpdate": { { // redundant "1": { "country": "USA", "title": "string" } } // redundant
}
correct one :
"elementsToUpdate": { "1": { "country": "USA", "title": "string" }
}

Below is the complete example where I have converted a class to JSON string and back. You can use the same as reference. The point here is I have used TypeReference class to tell JSON that I have a class Contribution of type MovieRequest. Your code inside the project which reads the JSON has to be like this.

The Main Test Class

public class Test1
{ public static void main(String[] args) throws IOException{ //Creating object of the contribution class. Contribution<MovieRequest> c = new Contribution<>(); Set<MovieRequest> set = new HashSet<>(); set.add(getMovieObject()); set.add(getMovieObject()); set.add(getMovieObject()); Map<Long, MovieRequest> map = new HashMap<>(); map.put(1L, getMovieObject()); map.put(2L, getMovieObject()); map.put(3L, getMovieObject()); Set<Long> set2 = new HashSet<>(); set2.add(1L); set2.add(2L); set2.add(3L); c.setElementsToAdd(set); c.setElementsToUpdate(map); c.setIdsToDelete(set2); //Using Jackson for Conversion. ObjectMapper mapper = new ObjectMapper(); String value = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(c); //JSON String System.out.println(value); //Converting JSON string back to Object //here I am using TyperReference to tell JSON that this is the type of the class Contribution<MovieRequest> c1 = mapper.readValue(value, new TypeReference<Contribution<MovieRequest>>() { }); System.out.println(c1); } //Just some class to spit out random strings. You can ignore it in ur example. Just add some random strings and return objects. private static MovieRequest getMovieObject() { MovieRequest m1 = new MovieRequest(); m1.setCountry(randomString()); m1.setTitle(randomString()); return m1; } //This is a random string generator. Ignore this. public static String randomString() { return RandomStringUtils.randomAlphanumeric(17); }
}

The Bean classes

class Contribution<T extends MovieRequest>
{ private Set<T> elementsToAdd; private Map<Long, T> elementsToUpdate; private Set<Long> idsToDelete; /** * @return the elementsToAdd */ public Set<T> getElementsToAdd() { return elementsToAdd; } /** * @param elementsToAdd * the elementsToAdd to set */ public void setElementsToAdd(Set<T> elementsToAdd) { this.elementsToAdd = elementsToAdd; } /** * @return the elementsToUpdate */ public Map<Long, T> getElementsToUpdate() { return elementsToUpdate; } /** * @param elementsToUpdate * the elementsToUpdate to set */ public void setElementsToUpdate(Map<Long, T> elementsToUpdate) { this.elementsToUpdate = elementsToUpdate; } /** * @return the idsToDelete */ public Set<Long> getIdsToDelete() { return idsToDelete; } /** * @param idsToDelete * the idsToDelete to set */ public void setIdsToDelete(Set<Long> idsToDelete) { this.idsToDelete = idsToDelete; } /** * @inheritDoc */ @JsonIgnore @Override public String toString() { return "Contribution [elementsToAdd=" + elementsToAdd + ", elementsToUpdate=" + elementsToUpdate + ", idsToDelete=" + idsToDelete + "]"; }
}
class MovieRequest
{ private String country; private String title; /** * @return the country */ public String getCountry() { return country; } /** * @param country * the country to set */ public void setCountry(String country) { this.country = country; } /** * @return the title */ public String getTitle() { return title; } /** * @param title * the title to set */ public void setTitle(String title) { this.title = title; } /** * @inheritDoc */ @JsonIgnore @Override public String toString() { return "MovieRequest [country=" + country + ", title=" + title + "]"; }
}

Output

{ "elementsToAdd" : [ { "country" : "08Pv3v048kXbz9gRg", "title" : "ljuih0hctsTRC2FfY" }, { "country" : "847JRWP65Fum3Ttm5", "title" : "Z7kS3YGbyjKOVTX6p" }, { "country" : "JmkjGDW81BMDyyPgj", "title" : "X3c5J0xurKsbXNgCY" } ], "elementsToUpdate" : { "1" : { "country" : "ItZF8GgzFMAs8WRk5", "title" : "tMnb1z1ooSUOuqEMS" }, "2" : { "country" : "HOhk142Q6brYmOMWC", "title" : "7FQv9TVj6nOjxU2Ri" }, "3" : { "country" : "hJYbY33KOsMbJN2o6", "title" : "uW5zEkoosux9QsC44" } }, "idsToDelete" : [ 1, 2, 3 ]
}
Contribution [elementsToAdd=[MovieRequest [country=08Pv3v048kXbz9gRg, title=ljuih0hctsTRC2FfY], MovieRequest [country=847JRWP65Fum3Ttm5, title=Z7kS3YGbyjKOVTX6p], MovieRequest [country=JmkjGDW81BMDyyPgj, title=X3c5J0xurKsbXNgCY]], elementsToUpdate={1=MovieRequest [country=ItZF8GgzFMAs8WRk5, title=tMnb1z1ooSUOuqEMS], 2=MovieRequest [country=HOhk142Q6brYmOMWC, title=7FQv9TVj6nOjxU2Ri], 3=MovieRequest [country=hJYbY33KOsMbJN2o6, title=uW5zEkoosux9QsC44]}, idsToDelete=[1, 2, 3]]

Your Answer

Sign up or log in

Sign up using Google Sign up using Facebook Sign up using Email and Password Submit

Post as a guest

Post Your Answer Discard

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy