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@JsonTypeName is used to set type names to be used for annotated class.
Example – @JsonTypeName
import java.io.IOException; import com.fasterxml.jackson.annotation.JsonSubTypes; import com.fasterxml.jackson.annotation.JsonTypeInfo; import com.fasterxml.jackson.annotation.JsonTypeInfo.As; import com.fasterxml.jackson.annotation.JsonTypeName; import com.fasterxml.jackson.databind.ObjectMapper; public class JacksonTester { public static void main(String args[]) throws IOException { Shape shape = new JacksonTester.Circle("CustomCircle", 1); String result = new ObjectMapper() .writerWithDefaultPrettyPrinter() .writeValueAsString(shape); System.out.println(result); String json = "{"name":"CustomCircle","radius":1.0, "type":"circle"}"; Circle circle = new ObjectMapper().readerFor(Shape.class).readValue(json); System.out.println(circle.name); } @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = As.PROPERTY, property = "type") @JsonSubTypes({ @JsonSubTypes.Type(value = Square.class, name = "square"), @JsonSubTypes.Type(value = Circle.class, name = "circle") }) static class Shape { public String name; Shape(String name){ this.name = name; } } @JsonTypeName("square") static class Square extends Shape { public double length; Square(){ this(null,0.0); } Square(String name, double length){ super(name); this.length = length; } } @JsonTypeName("circle") static class Circle extends Shape { public double radius; Circle(){ this(null,0.0); } Circle(String name, double radius){ super(name); this.radius = radius; } } }
Output
{ "type" : "circle", "name" : "CustomCircle", "radius" : 1.0 } CustomCircle
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