[英]Unable to deserialize Object Array via Jackson Yaml
我正在尝试反序列化一个 YAML 配置文件,该文件将特定操作(枚举)映射到参数(String[])。 为了有一个 YAML 的起点,我首先用 Java 构建了对象结构,然后将其序列化。
读回该输出并反序列化它也会导致下面的异常,这是出乎意料的,因为它直接来自马口。
我的Java结构:
@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(这直接取自 Jackson 的序列化输出,读回会导致以下异常):
actions: !<java.util.ImmutableCollections$List12>
- !<java.util.ImmutableCollections$List12>
arguments:
- 90.00
action: Left
用于反序列化的 Jackson 服务:
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
编辑#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);
我的杰克逊实现大致是这样的:
outputStream.write(objectMapper.writeValueAsBytes(data));
对象映射器提供者:
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());
解决方法很简单:
动作: !<java.util.ArrayList>
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.