How to Configure Spring's ObjectMapper to Serialize Only @JsonProperty Annotated Fields?

Configuring ObjectMapper in Spring: Restrict Field Serialization

To configure the ObjectMapper to serialize only fields annotated with @JsonProperty, consider the following approach:

1. Create a Custom ObjectMapper

public class CustomObjectMapper extends ObjectMapper {
    public CustomObjectMapper() {
        super();
        setVisibility(Visibility.NONE).enable(Visibility.NON_EMPTY);
    }
}

This custom ObjectMapper disables serialization of non-annotated fields and only includes fields where the value is non-null.

2. Register the Custom ObjectMapper in Spring

In your servlet.xml, register the custom ObjectMapper as follows:

<bean>

3. Update Annotation-Based Configuration

Ensure that your @Configuration class registers the custom CountingJacksonHttpMessageConverter:

@Configuration
public class JacksonConfiguration {

    @Bean
    public MappingJacksonHttpMessageConverter jsonConverter() {
        MappingJacksonHttpMessageConverter converter = new MappingJacksonHttpMessageConverter();
        converter.setObjectMapper(jacksonObjectMapper());
        return converter;
    }
}

4. Ensure Proper Version Dependency

Verify that you are using a compatible version of Jackson. In this case, Jackson 2.x is recommended for use with Spring.

5. Verify Exclude Default Jackson Annotations

Ensure that the default Jackson annotations are excluded from visibility detection by overriding the setVisibility method in your custom ObjectMapper.

Additional Considerations:

• This approach only serializes fields annotated with @JsonProperty and not those marked with other annotations (e.g., @JsonSerialize).
• Note that excluding fields from serialization may affect the functionality of other components that rely on the default behavior (e.g., persistence, validation).
• For more advanced serialization customization, refer to the Jackson documentation.

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