Jackson JSON java类 - 字段被序列化多次

Question

我定义了以下类

@JsonTypeName("PhotoSetUpdater")
public class PhotoSetUpdater {
@JsonProperty("Title")
private String title;
@JsonProperty("Caption")
private String caption;
@JsonProperty("Keywords")
private String[] keywords;
@JsonProperty("Categories")
private int[] categories;
@JsonProperty("CustomReference")
    private String customReference;      // new in version 1.1


public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public String getCaption() {
    return caption;
}

public void setCaption(String caption) {
    this.caption = caption;
}


public String getCustomReference() {
    return customReference;
}


public void setCustomReference(String customReference) {
    this.customReference = customReference;
}


public void setKeywords(String[] keywords) {
    this.keywords = keywords;
}

public String[] getKeywords() {
    return keywords;
}


public void setCategories(int[] categories) {
    this.categories = categories;
}


public int[] getCategories() {
    return categories;
}

}

问题是，在我用 Jackson JSON 序列化器序列化这个类之后，这些字段在结果负载中插入了两次：一个以小写字母开头，一个以大写字母开头：

... {"Caption":"aa","caption":"aa",...}

类型定义可能有什么问题？

问候

Answer 1

尝试在课堂上使用@JsonAutoDetect(getterVisibility=Visibility.NONE)。