I am creating a spring boot application which receives some JSON data from a 3rd party api. The JSON data has so many nested objects.I want to map them as Java objects. Below is the code I wrote for getting the api response.
public ResponseEntity<MovieSearchResultsDto> getMovies(String searchText, String countryCode) {
logger.info("GetMovies Service started");
String url = prepareUrl(searchText,countryCode);
HttpHeaders header = new HttpHeaders();
prepareHeader(header);
HttpEntity<String> requestEntity = new HttpEntity<String>(header);
try {
logger.info("Calling the API for movie info");
responseEntity = restClient.exchange(url,
HttpMethod.GET,
requestEntity,
MovieSearchResultsDto.class);
}catch (Exception e) {
logger.error("Exception occured while calling the API "+ e);
if(responseEntity.getStatusCodeValue() != 200) {
}
}
logger.info("GetMovies Service Ended");
return responseEntity;
}
And the JSON response looks like
{
"results": [
{
"id": ******,
"picture": "url",
"name": "Titanic",
"locations": [
{
"icon": "url",
"display_name": "Amazon Instant Video",
"name": "AmazonInstantVideoIVAGB",
"id": "***",
"url": "url"
}
],
"provider": "iva",
"weight": 0,
"external_ids": {
"iva_rating": null,
"imdb": {
"url": "url",
"id": "tt0046435"
},
"tmdb": {
"url": "url",
"id": "id"
},
"wiki_data": {
"url": "url",
"id": "id"
},
"iva": null,
"gracenote": null,
"rotten_tomatoes": null,
"facebook": null
}
}
] }
What I have done is , I created a class MovieSearchResultsDto and include a list as its data member with getters and setters.
private List<MoviesDto> results = new ArrayList<>();
And created MoviesDto class as below
public class MoviesDto {
private String id;
private String name;
private String picture;
@JsonInclude(value = Include.NON_EMPTY)
private List<MovieLocation> locations = new ArrayList<MovieLocation>();
@JsonInclude(value = Include.NON_EMPTY)
private List<ExternalIds> external_ids = new ArrayList<ExternalIds>();
public MoviesDto() {
}
//getters and setters
}
class MovieLocation{
private String icon;
private String id;
private String display_name;
private String name;
private String url;
public MovieLocation() {
}
//getters and setters
}
class ExternalIds{
private IdAndUrl imdb;
private IdAndUrl tmdb;
private IdAndUrl wiki_data;
public ExternalIds() {
}
//getters and setters
}
class IdAndUrl{
private String url;
private String id;
public IdAndUrl() {
}
//getters and setters
}
But it shows error while parsing.
Exception occured while calling the API org.springframework.web.client.RestClientException: Error while extracting response for type [class com.prebeesh1427.MovieNameServiceProvider.dto.MovieSearchResultsDto] and content type [application/json]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of `java.util.ArrayList<com.prebeesh1427.MovieNameServiceProvider.dto.ExternalIds>` out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.ArrayList<com.prebeesh1427.MovieNameServiceProvider.dto.ExternalIds>` out of START_OBJECT token
at [Source: (PushbackInputStream); line: 1, column: 1054] (through reference chain: com.prebeesh1427.MovieNameServiceProvider.dto.MovieSearchResultsDto["results"]->java.util.ArrayList[0]->com.prebeesh1427.MovieNameServiceProvider.dto.MoviesDto["external_ids"])
I am a newbie to this area. Kindly help me not just only to resolve this issue but to understand the concept of these parsing techniques too.
Thanks in advance