Jackson - custom serializer that overrides only specific fields

Question

I know how to use a custom serializer in Jackson (by extending JsonSerializer), but I want the default serializer to work for all fields, except for just 1 fiel

Answer 1

I faced the same issue, and I solved it with CustomSerializerFactory.

This approach allows you to ignore some specific field for either for all objects, or for specific types.

public class EntityCustomSerializationFactory extends CustomSerializerFactory {

    //ignored fields
    private static final Set IGNORED_FIELDS = new HashSet(
            Arrays.asList(
                    "class",
                    "value",
                    "some"
            )
    );


    public EntityCustomSerializationFactory() {
        super();
    }

    public EntityCustomSerializationFactory(Config config) {
        super(config);
    }

    @Override
    protected void processViews(SerializationConfig config, BeanSerializerBuilder builder) {
        super.processViews(config, builder);

        //ignore fields only for concrete class
        //note, that you can avoid or change this check
        if (builder.getBeanDescription().getBeanClass().equals(Entity.class)){
            //get original writer
            List originalWriters = builder.getProperties();

            //create actual writers
            List writers = new ArrayList();

            for (BeanPropertyWriter writer: originalWriters){
                String propName = writer.getName();

                //if it isn't ignored field, add to actual writers list
                if (!IGNORED_FIELDS.contains(propName)){
                    writers.add(writer);
                }
            }

            builder.setProperties(writers);
        }

    }
}

And afterwards you can use it something like the following:

objectMapper.setSerializerFactory(new EntityCustomSerializationFactory());
objectMapper.writeValueAsString(new Entity());//response will be without ignored fields