Weird exception of AWS JDK: "AmazonDynamoDBException: User not found"

Question

I am working on adding a new library that depends on AWS JDK to my project, however, some other untouched existing component querying DynamoDB throws the exception:

```
Caused by: com.amazonaws.services.dynamodbv2.model.AmazonDynamoDBException: User not found: the_user_key (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: UnrecognizedClientException; Request ID: null; Proxy: null)
```
`the_user_key` works well before I add the new library, but it suddenly says the user was not found.
I am using `com.amazonaws:aws-java-sdk-dynamodb:1.11.704`, `"com.amazonaws:aws-java-sdk-core:1.11.704"`, and there are also a bunch of `software.amazon.awssdk` with version 2.16.87.

I am wondering if anybody encountered similar issues before, or if anybody could give any advice.

Answer

If updating to the latest version of the AWS SDK does not resolve the issue, you may want to check your AWS credentials and ensure that the user associated with "the_user_key" has the appropriate permissions to access DynamoDB. You can also try testing your credentials and permissions with the AWS CLI to ensure that they are working properly.

Weird exception of AWS JDK: "AmazonDynamoDBException: User not found"

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