DynamoDb error: converter not found for EnhancedType(java.util.Optional)

Describe the issue

I’m trying to write to DynamoDb my object model with an Optional field, but it does not work. If I exclude the Optional field from my model I can successfully save it to DynamoDb.

Steps to Reproduce

private final String notificationText;

public Optional<String> getNotificationText() {
    return Optional.ofNullable(notificationText);
}

public void setNotificationText(Optional<String> notificationText) {
    // Do nothing, this is a derived attribute
}

Current behavior

I’m obtaining this error: java.lang.IllegalStateException: Converter not found for EnhancedType(java.util.Optional)

I’m trying to create my custom ConvertProvider implementing AttributeConverterProvider and using the OptionalAttributeConverter but I don’t understand how to use it. Can someone help me?

AWS Java SDK version used

dynamodb-enhanced version 2.17.102

JDK version used

openjdk version “1.8.0_312”

Operating System and version

Linux 5.4.0-91-generic #102-Ubuntu