Thread: [634] Jackson ignore class from serialization

I'm currently using [Only registered and activated users can see links. ]to serialize my player saves, but I can't seem to find how to ignore/skip specific classes from being serialized. I've tried using the annotation @[Only registered and activated users can see links. ]IgnoreType like it was recommended [Only registered and activated users can see links. ], but that only seems to work for actual fields (not entries in a list). I've also tried tagging the classes I want to ignore with @[Only registered and activated users can see links. ]IgnoreType and using a custom annotation introspector, but it just saves the empty classes without the fields (except for className):

Code:

saveMapper.setAnnotationIntrospector(new JacksonAnnotationIntrospector() {
    @Override
    public boolean hasIgnoreMarker(AnnotatedMember m) {
        return super.hasIgnoreMarker(m) || m.getDeclaringClass().getAnnotation(JsonIgnoreType.class) != null;
    }
});

...

  @[Only registered and activated users can see links. ]IgnoreType
private static class ScriptA extends Script {
    private int dontKeep;

    public ScriptA() {
        dontKeep = 25;
    }
}

Result:

Code:

{
    "scripts" : [ {
        "className" : "com.JsonExemple$ScriptA"
    }, {
        "className" : "com.JsonExemple$ScriptB",
        "keep" : 50
    } ]
}

Here's a simplified snippet of what I'm trying to achieve:

Code:

package com;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationFeature;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 * @author clem585
 *  @[Only registered and activated users can see links. ]d 28/02/2021 - 1:43 AM
 */
public class JsonExemple {

    public static void main(String[] args) {
        try {
            // create Jackson JSON writer
            ObjectMapper saveMapper = new ObjectMapper()
                    .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);

            ObjectWriter saveWriter = saveMapper.writer().withDefaultPrettyPrinter();

            // instantiate class I want to save
            ExempleClass exempleClass = new ExempleClass();

            // create empty file
            File file = new File("D:/Desktop/exemple.json");
            new File("D:/Desktop/").mkdirs();
            file.createNewFile();

            saveWriter.writeValue(file, exempleClass);
            System.out.println("Saved exemple.json on the desktop of the D drive");
        } catch (Exception e) {
            System.out.println("Exception attempting to save exemple");
            e.printStackTrace();
        }
    }

    private static class ScriptB extends Script {
         @[Only registered and activated users can see links. ]Property
        private int keep;

        public ScriptB() {
            keep = 50;
        }
    }

    // ignore this class
    private static class ScriptA extends Script {
        private int dontKeep;

        public ScriptA() {
            dontKeep = 25;
        }
    }

     @[Only registered and activated users can see links. ]TypeInfo(use = JsonTypeInfo.Id.CLASS, property = "className")
    private static abstract class Script {

    }

    private static class ExempleClass {
         @[Only registered and activated users can see links. ]Property
        private List<Script> scripts;

        public ExempleClass() {
            scripts = new ArrayList<>();
            scripts.add(new ScriptA());
            scripts.add(new ScriptB());
        }
    }

}

Edit: Ended up getting some help and the easy answer seems to be to use a custom getters for the scripts:

Code:

    @[Only registered and activated users can see links. ]Property("playerScripts")
    private List<PlayerScript> filterScriptsForJson() {
        return playerScripts.stream()
                .filter(s -> s.getClass().getAnnotation(JsonIgnoreType.class) == null)
                .collect(Collectors.toList());
    }