Java 为DynamoDB嵌套和组合注释不起作用

我有一个相当简单的java对象结构，带有注释，但不起作用。看起来是这样的：

@DynamoDBDocument
public class Job {

    @DynamoDBHashKey
    private String id;

    @DynamoDBAttribute(attributeName = "mapping")
    private Definition definition;
}

@DynamoDBDocument
public class Definition {
    @DynamoDBAttribute(attributeName = "calculationMap")
    @DynamoDBTypeConverted(converter = AssignmentsConverter.class)
    private Map<String, Calculation> assignments;
}

mapping: {
    calculationMap: {
        attribute1: "string representing Calculation",
        attribute2: "string representing Calculation"
    }
}

definition: {
    assignments: {
        attribute1: Calculation1,
        attribute2: Calculation2
    }
}

definition: {
    assignments: null
}

因此，我希望我的java作业对象如下所示：

@DynamoDBDocument
public class Job {

    @DynamoDBHashKey
    private String id;

    @DynamoDBAttribute(attributeName = "mapping")
    private Definition definition;
}

@DynamoDBDocument
public class Definition {
    @DynamoDBAttribute(attributeName = "calculationMap")
    @DynamoDBTypeConverted(converter = AssignmentsConverter.class)
    private Map<String, Calculation> assignments;
}

mapping: {
    calculationMap: {
        attribute1: "string representing Calculation",
        attribute2: "string representing Calculation"
    }
}

definition: {
    assignments: {
        attribute1: Calculation1,
        attribute2: Calculation2
    }
}

definition: {
    assignments: null
}

但是，注释无法正确地反序列化映射。转换器代码从未被调用，我最终得到一个具有映射的作业对象，但映射中的assignments字段为null。所以基本上看起来是这样的：

@DynamoDBDocument
public class Job {

    @DynamoDBHashKey
    private String id;

    @DynamoDBAttribute(attributeName = "mapping")
    private Definition definition;
}

@DynamoDBDocument
public class Definition {
    @DynamoDBAttribute(attributeName = "calculationMap")
    @DynamoDBTypeConverted(converter = AssignmentsConverter.class)
    private Map<String, Calculation> assignments;
}

mapping: {
    calculationMap: {
        attribute1: "string representing Calculation",
        attribute2: "string representing Calculation"
    }
}

definition: {
    assignments: {
        attribute1: Calculation1,
        attribute2: Calculation2
    }
}

definition: {
    assignments: null
}

转换器本身相当简单，因此除非请求，否则我不会提供代码。然而，它不应该引起问题，因为它甚至没有被调用

---

在我添加

@DynamoDBAttribute

注释并更改java字段的名称之前，代码运行良好。但是名称都匹配，所以我担心这可能与各种注释之间的交互有关？我真的不确定。

为了解决这个问题，我费了好几个小时的功夫，结果证明这是我的一个简单错误-我在查看DynamoDB以查看我提取的数据，但在某个时候我用null覆盖了它，没有刷新。通过刷新DynamoDB中的视图，我可以看到它现在为空。我将calculationMap重置为一个有效值，瞧，它按预期工作