// Example.java
package org.hueho.issue;

import io.avaje.jsonb.Json;

@Json
public class Example {
    private int code;
    private WrapMap map;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public WrapMap getMap() {
        return map;
    }

    public void setMap(WrapMap map) {
        this.map = map;
    }
}

// WrapMap.java
package org.hueho.issue;

import java.util.*;

public class WrapMap extends AbstractMap<String, String> {
    private final Map<String, String> delegate;

    public WrapMap(Map<String, String> map) {
        delegate = map;
    }

    @Override
    public Set<Entry<String, String>> entrySet() {
        return delegate.entrySet();
    }
}

// WrapMapJsonAdapter.java
package org.hueho.issue;

import io.avaje.json.JsonAdapter;
import io.avaje.json.JsonReader;
import io.avaje.json.JsonWriter;
import io.avaje.jsonb.CustomAdapter;
import io.avaje.jsonb.Jsonb;
import io.avaje.jsonb.Types;

import java.util.Map;

@CustomAdapter
public class WrapMapJsonAdapter implements JsonAdapter<WrapMap> {
    private final JsonAdapter<Map<String, String>> stringMapJsonAdapter;

    public WrapMapJsonAdapter(Jsonb jsonb) {
        this.stringMapJsonAdapter = jsonb.adapter(Types.newParameterizedType(Map.class, String.class, String.class));
    }

    @Override
    public WrapMap fromJson(JsonReader reader) {
        return new WrapMap(stringMapJsonAdapter.fromJson(reader));
    }

    @Override
    public void toJson(JsonWriter writer, WrapMap wrapMap) {
        writer.beginObject();
        wrapMap.forEach((key, value) -> {
            writer.name(key);
            writer.value(value);
        });
        writer.endObject();
    }
}