Enhanced Dynamodb not support List<CustomObject> type?

[user20161119]

In my table schema there is List property,try to save the object,got following error

Converter not found for EnhancedType(java.util.List<com.kjds.table.common.OperationLog>)
	at software.amazon.awssdk.enhanced.dynamodb.DefaultAttributeConverterProvider.lambda$findConverter$2(DefaultAttributeConverterProvider.java:155)
	at java.util.Optional.orElseThrow(Optional.java:290)
	at software.amazon.awssdk.enhanced.dynamodb.DefaultAttributeConverterProvider.findConverter(DefaultAttributeConverterProvider.java:155)
	at software.amazon.awssdk.enhanced.dynamodb.DefaultAttributeConverterProvider.converterFor(DefaultAttributeConverterProvider.java:133)
	at software.amazon.awssdk.enhanced.dynamodb.mapper.ImmutableAttribute.converterFrom(ImmutableAttribute.java:167)
	at software.amazon.awssdk.enhanced.dynamodb.mapper.ImmutableAttribute.resolve(ImmutableAttribute.java:163)
	at software.amazon.awssdk.enhanced.dynamodb.mapper.StaticImmutableTableSchema.lambda$new$0(StaticImmutableTableSchema.java:153)`

[kevcodez]

Annotating the child class, in your case OperationLog with @DynamoDbBean solved this issue for me but when retreiving the saved data from dynamo db, the items in the list are all null.

[debora-ito]

By default, the SDK provides attribute converters for all primitive and many common Java types, you can see the list and the converters implementation here:
https://github.com/aws/aws-sdk-java-v2/tree/master/services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/internal/converter/attribute

If you are using a custom object, you need to write a custom AttributeConverter so the enhanced client can know how to transform the custom type to a DynamoDB supported type, and transform it back. Then use the @DynamoDbBean 'converterProviders' annotation to indicate which providers must be used for that Bean. Check "Control attribute conversion" in the DynamoDB Enhanced Client overview for more detailed info.

[kevcodez]

@debora-ito If I understand correctly, this should work out-of-the-box, if I annotate both classes with @DynamoDbBean.

@DynamoDbBean
data class Customer(
 var id: String ? = null,
 var quota: List<Quota>? = null
)

@DynamoDbBean
data class Quota(
  var type: String? = null,
  var quota: Int? = null
)

Shouldn't that be enough to successfully save and retrieve the customer DTO? At least it sounded like that in other Github issues

[user20161119]

@debora-ito If I understand correctly, this should work out-of-the-box, if I annotate both classes with @DynamoDbBean.

@DynamoDbBean
data class Customer(
 var id: String ? = null,
 var quota: List<Quota>? = null
)

@DynamoDbBean
data class Quota(
  var type: String? = null,
  var quota: Int? = null
)

Shouldn't that be enough to successfully save and retrieve the customer DTO? At least it sounded like that in other Github issues

not work with java sdk either

[debora-ito]

@kevcodez @user20161119 Can you provide a repro code? I ran some simple tests locally and it works for me, for both putItem and getItem.

[user20161119]

@kevcodez @user20161119 Can you provide a repro code? I ran some simple tests locally and it works for me, for both putItem and getItem.

thanks,my test result is when the collection property is private Set<OperationLog> orderItemList = new HashSet<>();
not work
but List<OperationLog> work

[debora-ito]

@user20161119 Noted. Can you provide a minimal reproducible code?