Jackson annotation unable to parse boolean field

Question

My Java class corresponding to the data is as below,

package com.some.package;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.gson.reflect.TypeToken;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.lang.reflect.Type;


@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@JsonIgnoreProperties(ignoreUnknown = true)
public class A {
    public static final Type UNMARSHALLER_TYPE = new TypeToken<A>(){}.getType();

    @JsonProperty("id")
    String id;

    @JsonProperty("name")
    String name;

    @JsonProperty("is_enabled")
    boolean isEnabled;
}

Test case class which I have written is failing because the isEnabled is always false

package com.some.package;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import org.junit.Test;

import java.io.IOException;

import static org.junit.Assert.*;

/**
 * Created by tanny on 16/11/19.
 */
public class ATest {

    private static final String RESPONSE_JSON = "{\"is_enabled\": true, \"name\": \"XXX\", \"id\":\"mock-id\", \"num\":12}";

    @Test
    public void testAUnmarshaller() throws IOException {
        // given
        PapiSite payload = new Gson().fromJson(RESPONSE_JSON, A.UNMARSHALLER_TYPE);

        // then
        assertNotNull(payload);
        assertTrue(payload.isEnabled());
        assertEquals("XXX", payload.getName());
    }
}

Looks like jackson data binder isn't able to parse the json string passed in the test. Any chance I am doing something wrong? Any help or guidance would be much appreciated.

Answer 1

The problem is you are mixing two different libraries jackson and Gson , JsonProperty , JsonIgnoreProperties belongs to jackson and you are trying parse using Gson in test case

Using Gson: You can use @SerializedName while using Gson, you can find more information here about Gson

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class A {
    public static final Type UNMARSHALLER_TYPE = new TypeToken<A>(){}.getType();

   @SerializedName("id")
   String id;

   @SerializedName("name")
   String name;

   @SerializedName("is_enabled")
   boolean isEnabled;
}

Using Jackson: you can use ObjectMapper , You can find more information here about jackson

 @Test
public void testAUnmarshaller() throws IOException {
    // given
   ObjectMapper objectMapper = new ObjectMapper();
    PapiSite payload = objectMapper.readValue(RESPONSE_JSON, A.class); 

    // then
    assertNotNull(payload);
    assertTrue(payload.isEnabled());
    assertEquals("XXX", payload.getName());
}