[Solved] org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type

I covert list to json and json back to list

ObjectMapper objectMapper = new ObjectMapper();

            // Convert list to json
            String json = objectMapper.writeValueAsString(personList);

            System.out.println(json);

            // Convert json back to list
            List<Person> person = objectMapper.readValue(json, new TypeReference<List<Person>>(){});

Is resullt:

run:
[{“firstName”:”Mike”,”lastName”:”harvey1″,”age”:34,”contact”:”001894536″},{“firstName”:”Mike”,”lastName”:”harvey2″,”age”:34,”contact”:”001894536″},{“firstName”:”Mike”,”lastName”:”harvey3″,”age”:34,”contact”:”001894536″},{“firstName”:”Mike”,”lastName”:”harvey4″,”age”:34,”contact”:”001894536″}]
org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class gson.Main$Person]: can not instantiate from JSON object (need to add/enable type information?)
at [Source: java.io.StringReader@4566e5bd; line: 1, column: 3]
at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObjectUsingNonDefault(BeanDeserializer.java:740)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:683)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580)
at org.codehaus.jackson.map.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:217)
at org.codehaus.jackson.map.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:194)
at org.codehaus.jackson.map.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:30)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2723)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1861)
at gson.Main.main(Main.java:48)
BUILD SUCCESSFUL (total time: 0 seconds)

Hi,

I wrote the problem in last post.
I got the solution. we have to use jackson2.

Regards,
Vijay

It solve the problem. But I don’t want to use default Constructor. As I am using Jackson annotation (@JsonDeserialize) to deserialize and serialize.

Below, I am writing the sample code:

@JsonInclude(Include.NON_NULL)
@JsonDeserialize(builder = Employee.Builder.class)
public final class Employee {
private final String name;
public Employee(final String name) {
this.name = name;
}
public String getName() {
return name;
}
public static final class Builder {
private final String name;
public Builder() {
this.name = “”;
}

public Builder setName(
final String name) {
this.name = name;
return this;
}
public Employee build() {
return new Employee (name);
}
}
}

WebSerive:
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class Resource {
@POST
@Path(PathConstants.EmployeePath)
public Response postEmployee(final Employee employee) {
//some operation.
}

Error: Getting the same error as Lokesh mentioned above.

Thanks