Cannot deserialize instance of object out of START ARRAY token in Spring Webservice

Question

I m currently having trouble connecting to my webservice on android  I use jackson-core databind annotation-2 2 4 and Spring RESTWebService  If I access the URL from the browser I can see the JSON response   server return List Shop  looks like       name   shopqwe   mobiles      address    town   city    street   streetqwe   streetNumber   59   cordX  2 229997  cordY  1 002539    shoe     shoeName   addidas   number   631744030   producent   nike   price  999 0   sizes   30 0 35 0 38 0      From a Client endpoint  Android application  I receive this error message   08-26 17 43 07 406  E AllShopsAsyc 28203   Could not read JSON  Can not deserialize instance of com auginzynier data ShopContainer out of START ARRAY token 08-26 17 43 07 406  E AllShopsAsyc 28203    at  Source  com android okhttp internal http HttpTransport ChunkedInputStream 41efbd48  line  1  column  1   nested exception is com fasterxml jackson databind JsonMappingException  Can not deserialize instance of com auginzynier data ShopContainer out of START ARRAY token 08-26 17 43 07 406  E AllShopsAsyc 28203    at  Source  com android okhttp internal http HttpTransport ChunkedInputStream 41efbd48  line  1  column  1   08-26 17 43 07 406  E AllShopsAsyc 28203   org springframework http converter HttpMessageNotReadableException  Could not read JSON  Can not deserialize instance of com auginzynier data ShopContainer out of START ARRAY token   My server request  RestTemplate restTemplate   new RestTemplate    restTemplate getMessageConverters   add new MappingJackson2HttpMessageConverter     ShopContainer response    restTemplate getForObject url  ShopContainer class     where ShopContainer is   public class ShopContainer      private List lt Shop gt  shops    structure of Shop  Address and Shoe is    I ve omitted getters and setters    public class Shop    JsonProperty  name      private String name   JsonProperty  mobiles     private List lt String gt  mobiles   new ArrayList lt String gt      JsonProperty  address     private Address address   JsonProperty  shoe   private List lt Shoe gt  shoe   new ArrayList lt Shoe gt      public class Address    JsonProperty  town   private String town   JsonProperty  street   private String street   JsonProperty  streetNumber   private String streetNumber   JsonProperty  cordX   private Double cordX   JsonProperty  cordY   private Double cordY   public class Shoe    JsonProperty  shoeName   private String shoeName   JsonProperty  number   private String number   JsonProperty  producent   private String producent   JsonProperty  price   private Double price   JsonProperty  sizes   private List lt Double gt  sizes   new ArrayList lt Double gt       I ve look here and on google but still can t figure out what I am missing at this point   Any response would be greatly helpful   Regards    UPDATE   I ve fixed the JSON by using jackson s ObjectMapper with RequestMethod GET  It now returns a String   list is List lt Shop gt   ObjectMapper mapper   new ObjectMapper    mapper writeValue new File  D   Android  shop json    list   System out println mapper writerWithDefaultPrettyPrinter   writeValueAsString list    return mapper writerWithDefaultPrettyPrinter   writeValueAsString list     JSON in console looks like          name     shopqwe      mobiles            address           town     city        street     streetqwe        streetNumber     59        cordX    2 229997       cordY    2 002539         shoe             shoeName     addidas        number     631744033        producent     nike        price    10 0       sizes      30 0  35 0  38 0               Request still doesn t work - error is the same

User · Accepted Answer

Your json contains an array  but you re trying to parse it as an object  This error occurs because objects must start with     You have 2 options    You can get rid of the ShopContainer class and use Shop   instead  ShopContainer response    restTemplate getForObject      url  ShopContainer class     replace with  Shop   response    restTemplate getForObject url  Shop   class     and then make your desired object from it   You can change your server to return an object instead of a list  return mapper writerWithDefaultPrettyPrinter   writeValueAsString list     replace with  return mapper writerWithDefaultPrettyPrinter   writeValueAsString      new ShopContainer list

User · Answer

I ve had a very similar issue using spring-boot-starter-data-redis  To my implementation there was offered a  Bean for RedisTemplate as follows   Bean public RedisTemplate lt String  List lt RoutePlantCache gt  gt  redisTemplate RedisConnectionFactory connectionFactory        final RedisTemplate lt String  List lt RoutePlantCache gt  gt  template   new RedisTemplate lt  gt         template setConnectionFactory connectionFactory       template setKeySerializer new StringRedisSerializer         template setValueSerializer new Jackson2JsonRedisSerializer lt  gt  RoutePlantCache class            Add some specific configuration here  Key serializers  etc      return template     The fix was to specify an array of RoutePlantCache as following  template setValueSerializer new Jackson2JsonRedisSerializer lt  gt  RoutePlantCache   class     Below the exception I had  com fasterxml jackson databind exc MismatchedInputException  Cannot deserialize instance of        RoutePlantCache  out of START ARRAY token  at  Source   byte    quot                 truncated 1478 bytes   line  1  column  1      at com fasterxml jackson databind exc MismatchedInputException from MismatchedInputException java 59    jackson-databind-2 11 4 jar 2 11 4      at com fasterxml jackson databind DeserializationContext reportInputMismatch DeserializationContext java 1468    jackson-databind-2 11 4 jar 2 11 4      at com fasterxml jackson databind DeserializationContext handleUnexpectedToken DeserializationContext java 1242    jackson-databind-2 11 4 jar 2 11 4      at com fasterxml jackson databind DeserializationContext handleUnexpectedToken DeserializationContext java 1190    jackson-databind-2 11 4 jar 2 11 4      at com fasterxml jackson databind deser BeanDeserializer  deserializeFromArray BeanDeserializer java 604    jackson-databind-2 11 4 jar 2 11 4      at com fasterxml jackson databind deser BeanDeserializer  deserializeOther BeanDeserializer java 190    jackson-databind-2 11 4 jar 2 11 4      at com fasterxml jackson databind deser BeanDeserializer deserialize BeanDeserializer java 166    jackson-databind-2 11 4 jar 2 11 4      at com fasterxml jackson databind ObjectMapper  readMapAndClose ObjectMapper java 4526    jackson-databind-2 11 4 jar 2 11 4      at com fasterxml jackson databind ObjectMapper readValue ObjectMapper java 3572    jackson-databind-2 11 4 jar 2 11 4

User · Answer

Taking for granted that the JSON you posted is actually what you are seeing in the browser  then the problem is the JSON itself   The JSON snippet you have posted is malformed   You have posted               name     shopqwe            mobiles                 address                   town     city                street     streetqwe                streetNumber     59                cordX    2 229997               cordY    1 002539                     shoe                     shoeName     addidas                    number     631744030                    producent     nike                    price    999 0                   sizes     30 0  35 0  38 0                   while the correct JSON would be               name     shopqwe            mobiles                 address                   town     city                street     streetqwe                streetNumber     59                cordX    2 229997               cordY    1 002539                     shoe                        shoeName     addidas                    number     631744030                    producent     nike                    price    999 0                   sizes     30 0  35 0  38 0

[android] Cannot deserialize instance of object out of START_ARRAY token in Spring Webservice

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