Different names of JSON property during serialization and deserialization

Question

Is it possible  to have one field in class  but different names for it during serialization deserialization in Jackson library   For example  I have class  Coordiantes    class Coordinates    int red      For deserialization from JSON want to have format like this        red  12     But when I will serialize object  result should be like this one        r  12     I tried to implement this by applying  JsonProperty annotation both on getter and setter  with different values    class Coordiantes      int red        JsonProperty  r       public byte getRed           return red              JsonProperty  red       public void setRed byte red          this red   red            but I got an exception      org codehaus jackson map exc UnrecognizedPropertyException  Unrecognized field  red

User · Answer

You can use a combination of  JsonSetter  and  JsonGetter to control the deserialization  and serialization of your property  respectively  This will also allow you to keep standardized getter and setter method names that correspond to your actual field name   import com fasterxml jackson annotation JsonSetter      import com fasterxml jackson annotation JsonGetter   class Coordinates       private int red           Used during serialization      JsonGetter  r       public int getRed             return red                 Used during deserialization      JsonSetter  red       public void setRed int red            this red   red

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It s possible to have normal getter setter pair  You just need to specify access mode in  JsonProperty  Here is unit test for that   public class JsonPropertyTest      private static class TestJackson        private String color        JsonProperty value    device color   access   JsonProperty Access READ ONLY      public String getColor           return color               JsonProperty value    color   access   JsonProperty Access WRITE ONLY      public void setColor String color          this color   color                 Test   public void shouldParseWithAccessModeSpecified   throws Exception       String colorJson       color     red          ObjectMapper mapper   new ObjectMapper        TestJackson colotObject   mapper readValue colorJson  TestJackson class        String ser   mapper writeValueAsString colotObject       System out println  Serialized colotObject      ser           I got the output as follows   Serialized colotObject    device color   red

User · Answer

I know its an old question but for me I got it working when I figured out that its conflicting with Gson library so if you are using Gson then use  SerializedName  name   instead of  JsonProperty  name   hope this helps

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This was not what I was expecting as a solution  though it is a legitimate use case   My requirement was to allow an existing buggy client  a mobile app which already released  to use alternate names    The solution lies in providing a separate setter method like this    JsonSetter   r    public void alternateSetRed  byte red         this red   red

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You can use  jsonAlias which got introduced in jackson 2 9 0  Example   public class Info      JsonAlias    red       public String r      This uses r during serialization  but allows red as an alias during deserialization  This still allows r to be deserialized as well  though

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You can write a serialize class to do that   public class Symbol         private String symbol        private String name        public String getSymbol             return symbol            public void setSymbol String symbol            this symbol   symbol                public String getName             return name                public void setName String name            this name   name            public class SymbolJsonSerializer extends JsonSerializer lt Symbol gt          Override     public void serialize Symbol symbol  JsonGenerator jgen  SerializerProvider serializers  throws IOException  JsonProcessingException           jgen writeStartObject             jgen writeStringField  symbol   symbol getSymbol                Changed name to full name as the field name of Json string         jgen writeStringField  full name   symbol getName             jgen writeEndObject                            ObjectMapper mapper   new ObjectMapper                 SimpleModule module   new SimpleModule                module addSerializer Symbol class  new SymbolJsonSerializer                 mapper registerModule module                   only convert non-null field  option                mapper setSerializationInclusion Include NON NULL                 String jsonString   mapper writeValueAsString symbolList

User · Answer

They must have included this as a feature  because now setting a different  JsonProperty for a getter and setter results in exactly what you would expect  different property name during serialization and deserialization for the same field   Jackson version 2 6 7

User · Answer

Just tested and this works   public class Coordinates       byte red        JsonProperty  r       public byte getR           return red              JsonProperty  red       public void setRed byte red          this red   red            The idea is that method names should be different  so jackson parses it as different fields  not as one field   Here is test code   Coordinates c   new Coordinates    c setRed  byte  5    ObjectMapper mapper   new ObjectMapper    System out println  Serialization      mapper writeValueAsString c     Coordinates r   mapper readValue     red   25   Coordinates class   System out println  Deserialization      r getR       Result   Serialization    r  5  Deserialization  25

User · Answer

I would bind two different getters setters pair to one variable   class Coordinates      int red        JsonProperty  red       public byte getRed           return red             public void setRed byte red          this red   red              JsonProperty  r       public byte getR           return red             public void setR byte red          this red   red

User · Answer

You can use this variant  import lombok Getter  import com fasterxml jackson annotation JsonGetter  import com fasterxml jackson annotation JsonProperty           JsonProperty value    quot rr quot      for deserialization  Getter onMethod      JsonGetter value    quot r quot        for serialization private String rrrr   with Lombok getter

User · Answer

Annotating with  JsonAlias which got introduced with Jackson 2 9   without mentioning  JsonProperty on the item to be deserialized with more than one alias different names for a json property  works fine   I used com fasterxml jackson annotation JsonAlias for package consistency with com fasterxml jackson databind ObjectMapper for my use-case    For e g     Data  Builder public class Chair         JsonAlias   woodenChair    steelChair        private String entityType        Test public void test1         String str1       woodenChair     chair made of wood         System out println  mapper readValue str1  Chair class       String str2       steelChair     chair made of steel         System out println  mapper readValue str2  Chair class         just works fine

[java] Different names of JSON property during serialization and deserialization

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