Unable to put an item containing a Map<String, AttributeValue> into table with map schema?

[ghost]

I am trying to put an item that contains a Map<String, AttributeValue> into a dynamodb table.
I would expect something like this.

However, I am getting:

Converter not found for EnhancedType(java.util.Map<java.lang.String, software.amazon.awssdk.services.dynamodb.model.AttributeValue>)

I would understand if this was a map of a String to a custom Object, but shouldn't DynamoDb accept an AttributeValue?

For reference, here is my current code:

// Activity Class

DynamoDbEnhancedClient dynamoDbEnhancedClient = DynamoDbEnhancedClient.create();
TableSchema<Test> tableSchema = TableSchema.fromClass(Test.class);

DynamoDbTable<Test> testTable = dynamoDbEnhancedClient.table(
       System.getenv("testTable"), tableSchema
);

Map<String, AttributeValue> testMap = Map.of(
       "SampleKey",
       AttributeValue.builder().s("SampleValue").build()
);

Test testItem =
       Test.builder()
              .mapName("SampleMap")
              .stringToAttributeValueMap(
                     testMap
              )
              .build();

testTable.putItem(testItem);

// Test class

@Builder
@DynamoDbBean
@NoArgsConstructor
@AllArgsConstructor
public class Test {
    private String mapName;
    private Map<String, AttributeValue> stringToAttributeValueMap;

    @DynamoDbPartitionKey
    @DynamoDbAttribute("mapName")
    public String getMapName() {
        return mapName;
    }

    public void setMapName(String mapName) {
        this.mapName = mapName;
    }

    @DynamoDbAttribute("stringToAttributeValueMap")
    public Map<String, AttributeValue> getStringToAttributeValueMap() {
        return stringToAttributeValueMap;
    }

    public void setStringToAttributeValueMap(Map<String, AttributeValue> stringToAttributeValueMap) {
        this.stringToAttributeValueMap = stringToAttributeValueMap;
    }
}

[yasminetalby]

Hello @admbor ,

Thank you very much for your message.

You can find a list of the supported primitive Java data types and primitive wrapper classes in DynamoDB here : https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBMapper.DataTypes.html

You can use the DynamoDBTypeConverter which allows you map your own data types to a data type that is natively supported by DynamoDB. You can find documentation for this here : https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBMapper.ArbitraryDataMapping.html

The error message seems underlines the need for a converter in your case.

Let me know if you have any other questions.

Best,

Yasmine

[yasminetalby]

The documentation provided above is for Java SDK v1. The behavior is the same in Java SDK v2.
The control attribute conversion section of the dynamodb-enhanced Readme.md goes over the approach you should take for v2.
You would need to a single AttributeConverterProvider or a chain of ordered AttributeConverterProviders through the @DynamoDbBean 'converterProviders' annotation.

Best,

Yasmine

[ghost]

I am still unable to achieve what I am looking to do.

I would like to be able to put a map containing key value pairs of several types into dynamodb.
Like this:

But I need to model a schema that accepts all three of these types (Boolean, String, Number)
That's why I had a Map<String, AttributeValue> in the schema.

I understand I would need to write an AttributeConverter which converts the AttributeValue to the type it contains.

But even if I use an AttributeConverter, it only transforms from and to a set type (If the AttributeConverter transforms to a String type, but the AttributeValue being converted contains a Boolean, it would raise an exception)

How would I go about doing this?

Let me know if my explanation is unclear, I will try to add more details

[yasminetalby]

Hello @admbor ,

Thank you very much for the clarification on your use case. You are right, an attribute converter only transforms to a set type which doesn't allow for coverage of your use case.
It seems like there is no current support of the behavior you have mentioned. There has been previous mention of interest for support of this feature in #1975 and #2628. I will bring this up to the team!

Best,

Yasmine

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.