Problem

You can encounter this problem when you use org.modelmapper.ModelMapper library and class. In most cases the issue is that you don’t provide the Constructors and/or Getters and Setters for you class.

Type definition error: [simple type, class com.bigdataetl.model.dto.PersonDto]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class com.bigdataetl.model.dto.PersonDto and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: java.util.ArrayList[0])",

Solution with Lombok

Using Lombok if you use these three annotations, Lombok provides Constructors, Getters and Setters.

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class PersonDto {

    private String id;

    private String name;

    private int age;

}

Solution without Lombok

As you can see without Lombok you have to provide Constructors, Getters and Setters on your own. It’s not a convenient way. I encourage you to use Lombok in the future 🙂

public class PersonDto {

    private String id;

    private String name;

    private int age;

    public PersonDto(String id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public PersonDto() {
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

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