DynamoDB Exception: ExpressionAttributeValues must not be empty, even when there are no variables

[abc-rpg]

Describe the bug

With version 4 of the SDK and using the Document Model, PutItemAsync operations fail when passing a PutItemOperationConfig without any ExpressionAttributeValues, even if the ConditionalExpression has no variables.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

The operation should succeed as it did with V3 of the SDK.

Current Behavior

The operation throws the following exception:

AmazonDynamoDBException: ExpressionAttributeValues must not be empty

The behavior is the same, even if ExpressionAttributeValues is explicitly set to null or an empty collection.

Reproduction Steps

await table.PutItemAsync(document, new PutItemOperationConfig
{
    ConditionalExpression = new Expression { ExpressionStatement = "attribute_not_exists(pk)" }
};

Possible Solution

Setting the InitializeCollections to true fixes the issue.

Amazon.AWSConfigs.InitializeCollections = true;

However this is not the desired solution.

Additional Information/Context

Stack Trace:

at Amazon.Runtime.Internal.HttpErrorResponseExceptionHandler.HandleExceptionStream(IRequestContext requestContext, IWebResponseData httpErrorResponse, HttpErrorResponseException exception, Stream responseStream)
at Amazon.Runtime.Internal.HttpErrorResponseExceptionHandler.HandleExceptionAsync(IExecutionContext executionContext, HttpErrorResponseException exception)
at Amazon.Runtime.Internal.ExceptionHandler`1.HandleAsync(IExecutionContext executionContext, Exception exception)
at Amazon.Runtime.Internal.ErrorHandler.ProcessExceptionAsync(IExecutionContext executionContext, Exception exception)
at Amazon.Runtime.Internal.ErrorHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.CallbackHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.Signer.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.EndpointDiscoveryHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.EndpointDiscoveryHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.RetryHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.RetryHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.CallbackHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.BaseAuthResolverHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.CallbackHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.ErrorCallbackHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.Runtime.Internal.MetricsHandler.InvokeAsync[T](IExecutionContext executionContext)
at Amazon.DynamoDBv2.DocumentModel.Table.PutItemHelperAsync(Document doc, PutItemOperationConfig config, CancellationToken cancellationToken)
at Amazon.DynamoDBv2.DocumentModel.Table.PutItemAsync(Document doc, PutItemOperationConfig config, CancellationToken cancellationToken)

AWS .NET SDK and/or Package version used

AWSSDK.DynamoDBv2 4.0.0.3

Targeted .NET Platform

.NET 9

Operating System and version

Windows 11

[normj]

Thanks for reporting the issue. We'll take a look into the issue.

[abc-rpg]

Thank you! I verified the fix in 4.0.0.4.

I am however running into a new issue now, and I think still related to uninitialized collections. I'll be creating a new issue for that, and close this one since this is solved.

[github-actions]

Comments on closed issues are hard for our team to see.
If you need more assistance, please either tag a team member or open a new issue that references this one.
If you wish to keep having a conversation with other community members under this issue feel free to do so.