java - "MismatchedInputException: Cannot deserialize instance of ` java.lang.String ` out of START_OBJECT token"当内部标签与外部同名时

Question

尝试反序列化 XML 时

<Schedule>
    <Dates>
        <Calendar>USD</Calendar>
        <Convention>ModifiedFollowing</Convention>
        <Tenor>1M</Tenor>
        <Dates>
            <Date>2012-01-06</Date>
            <Date>2012-04-10</Date>
            <Date>2012-07-06</Date>
            <Date>2012-10-08</Date>
            <Date>2013-01-07</Date>
            <Date>2013-04-08</Date>
        </Dates>
    </Dates>
</Schedule>

进入

@Data
@JsonInclude(JsonInclude.Include.NON_EMPTY)
@JsonIgnoreProperties(ignoreUnknown = true)
public class ScheduleDto {

    @JsonProperty(value = "Dates")
    @JacksonXmlElementWrapper(useWrapping = false)
    private List<DatesDto> dates = new ArrayList<>();

}

@Data
@JsonInclude(JsonInclude.Include.NON_EMPTY)
@JsonIgnoreProperties(ignoreUnknown = true)
@JacksonXmlRootElement(localName = "Dates")
public class DatesDto {

    @JsonProperty(value = "Calendar")
    private String calendar;

    @JsonProperty(value = "Convention")
    private String convention;

    @JsonProperty(value = "Tenor")
    private String tenor;

    @JsonProperty(value = "Date")
    @JacksonXmlElementWrapper(localName = "Dates")
    private List<String> dates = new ArrayList<>();

}

它抛出一个错误:

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.lang.String` out of START_OBJECT token
 at [Source: (StringReader); line: 1, column: 108] (through reference chain: sh.zandr.sandbox.how2jackson.domain.ScheduleDto["Dates"]->java.util.ArrayList[0]->sh.zandr.sandbox.how2jackson.domain.DatesDto["Dates"]->java.util.ArrayList[0])

但是如果我将 xml 更改为

<Schedule>
    <DatesObj>
        <Calendar>USD</Calendar>
        <Convention>ModifiedFollowing</Convention>
        <Tenor>1M</Tenor>
        <Dates>
            <Date>2012-01-06</Date>
            <Date>2012-04-10</Date>
            <Date>2012-07-06</Date>
            <Date>2012-10-08</Date>
            <Date>2013-01-07</Date>
            <Date>2013-04-08</Date>
        </Dates>
    </DatesObj>
</Schedule>

和 ScheduleDto 到

@Data
@JsonInclude(JsonInclude.Include.NON_EMPTY)
@JsonIgnoreProperties(ignoreUnknown = true)
public class ScheduleDto {

    @JsonProperty(value = "DatesObj")
    @JacksonXmlElementWrapper(useWrapping = false)
    private List<DatesDto> dates = new ArrayList<>();

}

它工作正常。

这是 jackson 错误吗？因为我期望它将被递归处理，所以在内部 <Dates> 的反序列化期间它不会知道有关外部的任何信息 <Dates> 。 或者它可以以某种方式配置为正确反序列化原始 XML(因为我无法更改输入)？

Answer 1

看起来像是一个错误。这可能是问题(或此问题的重复问题之一):https://github.com/FasterXML/jackson-dataformat-xml/issues/294

可能会在2.11.1版本中修复。这就是我找到的全部内容。