How to Customize Spring's ObjectMapper to Serialize Only @JsonProperty Annotated Properties?

Configuring ObjectMapper in Spring

In Spring applications, the ObjectMapper is a crucial component for serializing and deserializing JSON data. You can customize the ObjectMapper to meet specific requirements, such as only serializing properties annotated with @JsonProperty.

To achieve this, the first step is to create a custom ObjectMapper class that extends the base ObjectMapper class provided by Jackson. Override the default visibility checker to exclude non-annotated properties:

public class MyCustomObjectMapper extends ObjectMapper {
    public MyCustomObjectMapper() {
        super();
        setVisibilityChecker(getSerializationConfig()
                .getDefaultVisibilityChecker()
                .withCreatorVisibility(JsonAutoDetect.Visibility.NONE)
                .withFieldVisibility(JsonAutoDetect.Visibility.NONE)
                .withGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withIsGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withSetterVisibility(JsonAutoDetect.Visibility.DEFAULT));
    }
}

Next, register the custom ObjectMapper bean in the Spring configuration file (servlet.xml):

<bean></bean>

Finally, configure the annotation-driven MVC framework to use the custom ObjectMapper:

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name="objectMapper" ref="customObjectMapper"></property>
            </bean>
        </list>
    </property>
</bean>

In the example code provided, the NumbersOfNewEvents class contains two public attributes:

public class NumbersOfNewEvents implements StatusAttribute {
    public Integer newAccepts;
    public Integer openRequests;
    // ...
}

However, only the newAccepts attribute is annotated with @JsonProperty:

@JsonProperty
public Integer newAccepts;

By configuring the ObjectMapper as described above, only the newAccepts attribute should be serialized when the NumbersOfNewEvents object is converted to JSON. This is because the custom ObjectMapper will exclude non-annotated properties during serialization.

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