I have a pretty simple Map I want to serialize and deserialize in Jackson, but I can't get it to work.
I have tried the following:
@JsonSerialize(keyUsing=TurnKeySerializer.class)
@JsonDeserialize(keyUsing = TurnKeyDeserializer.class)
Map<TurnKey, PlayerTurn> publicTurns = new TreeMap<>();
@JsonIgnoreProperties(ignoreUnknown = true)
@Data //Creates Getter/Setter etc
public class TurnKey implements Comparable<TurnKey> {
private final int turnNumber;
private final String username;
public TurnKey(int turnNumber, String username) {
this.turnNumber = turnNumber;
this.username = username;
}
@Override
public int compareTo(TurnKey o) {
int v = Integer.valueOf(turnNumber).compareTo(o.getTurnNumber());
if (v != 0) {
return v;
}
return username.compareTo(o.getUsername());
}
@Override
public String toString() {
return "{" +
"turnNumber:" + turnNumber +
", username:'" + username + "'" +
"}";
}
public class TurnKeySerializer extends JsonSerializer<TurnKey> {
@Override
public void serialize(TurnKey value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {
if (null == value) {
throw new IOException("Could not serialize object to json, input object to serialize is null");
}
StringWriter writer = new StringWriter();
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(writer, value);
gen.writeFieldName(writer.toString());
}
}
public class TurnKeyDeserializer extends KeyDeserializer {
private static final ObjectMapper mapper = new ObjectMapper();
@Override
public TurnKey deserializeKey(String key, DeserializationContext ctxt) throws IOException, JsonProcessingException {
return mapper.readValue(key, TurnKey.class);
}
}
But I get an exception
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.LinkedHashMap out of START_ARRAY token
