java/jackson-chained@JsonValue注释和反序列化

我有以下结构。我知道这看起来很奇怪，但我用这个例子模拟我们的代码：

public static class StringWrapper {
    protected final String s;

    @JsonValue
    public String getS() {
        return s;
    }

    public StringWrapper(final String s) {
        this.s = s;
    }
}

public static class StringWrapperOuter {
    protected final StringWrapper s;

    @JsonValue
    public StringWrapper getS() {
        return s;
    }

    public StringWrapperOuter(final StringWrapper s) {
        this.s = s;
    }
}

public static class POJO {
    protected final List<StringWrapperOuter> data;

    public List<StringWrapperOuter> getData() {
        return data;
    }

    public POJO(final List<StringWrapperOuter> data) {
        this.data = data;
    }

    public POJO() {
        data = Collections.emptyList();
    }
}

---

@JsonValue

用于序列化。反序列化的类似注释是

@JsonCreator

注释您的构造函数

@JsonCreator
public StringWrapper(final String s) {
    this.s = s;
}

及

---

正如索蒂里奥斯在先前的回答中所说的那样。

@JsonCreator

是这里的关键。但是，为了让所有类都工作，可能需要

@JsonProperty

public static class POJO {
    protected final List<StringWrapperOuter> data;

    // In order for POJO creation to work properly the @JsonProperty
    // annotation on the arg is required
    @JsonCreator
    public POJO(@JsonProperty("data") final List<StringWrapperOuter> data) {
        this.data = data;
    }

    public List<StringWrapperOuter> getData() {
        return data;
    }
}

public static class StringWrapper {
    protected final String s;

    @JsonCreator
    public StringWrapper(final String s) {
        this.s = s;
    }

    @JsonValue
    public String getS() {
        return s;
    }
}

public static class StringWrapperOuter {
    protected final StringWrapper s;

    @JsonCreator
    public StringWrapperOuter(final StringWrapper s) {
        this.s = s;
    }

    @JsonValue
    public StringWrapper getS() {
        return s;
    }
}

公共静态类POJO{
受保护的最终清单数据；
//为了使POJO创建正常工作，@JsonProperty
//参数上的注释是必需的
@JsonCreator
公共POJO（@JsonProperty（“数据”）最终列表数据）{
这个数据=数据；
}
公共列表getData（）{
返回数据；
}
}
公共静态类StringWrapper{
受保护的最终字符串s；
@JsonCreator
公共字符串包装器（最终字符串s）{
这个.s=s；
}
@JsonValue
公共字符串get（）{
返回s；
}
}
公共静态类StringWrapperOuter{
受保护的最终纵梁；
@JsonCreator
公共StringWrapper外部（最终StringWrapper）{
这个.s=s；
}
@JsonValue
公共StringWrapper get（）{
返回s；
}
}

Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class StringWrapperOuter] from String value ('a'); no single-String constructor/factory method
 at [Source: {"data":["a","b","c"]}; line: 1, column: 10] (through reference chain: POJO["data"]->java.util.ArrayList[0])

@JsonCreator
public StringWrapper(final String s) {
    this.s = s;
}

@JsonCreator
public StringWrapperOuter(final StringWrapper s) {
    this.s = s;
}

public static class POJO {
    protected final List<StringWrapperOuter> data;

    // In order for POJO creation to work properly the @JsonProperty
    // annotation on the arg is required
    @JsonCreator
    public POJO(@JsonProperty("data") final List<StringWrapperOuter> data) {
        this.data = data;
    }

    public List<StringWrapperOuter> getData() {
        return data;
    }
}

public static class StringWrapper {
    protected final String s;

    @JsonCreator
    public StringWrapper(final String s) {
        this.s = s;
    }

    @JsonValue
    public String getS() {
        return s;
    }
}

public static class StringWrapperOuter {
    protected final StringWrapper s;

    @JsonCreator
    public StringWrapperOuter(final StringWrapper s) {
        this.s = s;
    }

    @JsonValue
    public StringWrapper getS() {
        return s;
    }
}