Example demonstrating complexities of JsonUnwrapped

JsonUnwrappedTest.java

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonUnwrapped;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.junit.Test;

import java.io.IOException;

class JAddress {

    private String address;
    private String city;
    private String state;

    @JsonCreator
    public JAddress(
            @JsonProperty("address1") String address,
            @JsonProperty("city") String city,
            @JsonProperty("state") String state
    ){
        this.address = address;
        this.city = city;
        this.state = state;
    }

    public String getAddress1() { return address; }
    public String getCity() { return city; }
    public String getState() { return state; }
}

class JPerson {

    private String name;
    private JAddress address;
    private String alias;

    @JsonCreator
    public JPerson(
            @JsonProperty("name") String name,
            @JsonUnwrapped JAddress address,
            @JsonProperty("alias") String alias
    ) {
        this.name = name;
        this.address = address;
        this.alias = alias;
    }

    public String getName() {
        return name;
    }

    @JsonUnwrapped public JAddress getAddress() {
        return address;
    }

    public String getAlias() {
        return alias;
    }
}

public class JsonUnwrappedTest {

    @Test
    public void testReadWriteJson() throws IOException {
        JPerson person = new JPerson("MyName", new JAddress("main street", "springfield", null), null);
        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(person);
        System.out.println(json);
        JPerson obj = mapper.readValue(json, JPerson.class);

    }

}