[英]Unable to deserialize Object Array via Jackson Yaml
我正在嘗試反序列化一個 YAML 配置文件,該文件將特定操作(枚舉)映射到參數(String[])。 為了有一個 YAML 的起點,我首先用 Java 構建了對象結構,然后將其序列化。
讀回該輸出並反序列化它也會導致下面的異常,這是出乎意料的,因為它直接來自馬口。
我的Java結構:
@NoArgsConstructor
@AllArgsConstructor
@ToString(doNotUseGetters = true)
@Data
public class Session {
@EqualsAndHashCode.Exclude protected List<ActionInstance> actions;
}
@NoArgsConstructor
@AllArgsConstructor
@ToString(doNotUseGetters = true)
@Data
public class ActionInstance {
protected Action action;
protected String[] arguments;
}
public enum Action {
Left,
Right,
Up,
Down;
}
YAML(這直接取自 Jackson 的序列化輸出,讀回會導致以下異常):
actions: !<java.util.ImmutableCollections$List12>
- !<java.util.ImmutableCollections$List12>
arguments:
- 90.00
action: Left
用於反序列化的 Jackson 服務:
objectMapper.readValue(inputStream, Session.class)
例外:
com.fasterxml.jackson.databind.exc.MismatchedInputException
Unexpected token (VALUE_STRING), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class Action
編輯#1:
final Session export = new Session();
export.setActions(
List.of(
new ActionInstance(Action.Left, new String[] {"90.00"})));
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
serializationService.serialize(export, baos);
我的傑克遜實現大致是這樣的:
outputStream.write(objectMapper.writeValueAsBytes(data));
對象映射器提供者:
public class ObjectMapperProvider implements Provider<ObjectMapper> {
protected final ObjectMapper objectMapper = new ObjectMapper(new YAMLFactory());
protected final JavaTimeModule javaTimeModule = new JavaTimeModule();
@Inject
public ObjectMapperProvider() {
// Hack time module to allow 'Z' at the end of string (i.e. javascript json's)
javaTimeModule.addDeserializer(
LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ISO_DATE_TIME));
objectMapper.registerModule(javaTimeModule);
objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
objectMapper.activateDefaultTyping(objectMapper.getPolymorphicTypeValidator());
解決方法很簡單:
動作: !<java.util.ArrayList>
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