Write item to DynamoDB using Apache Camel with Java Annotations for DynamoDB

Question

Situation

I am trying to write to DynamoDB using the Apache Camel aws2-ddb component . My route reads from a relational database using JPA, performs a transformation to the target class and puts that class into a DynamoDB table.

The target class looks like this (more complex in reality, of course)

@DynamoDBTable(tableName = "MyDataTable")
public class MyData {
    private String key;
    private String foo;
    private List<String> bar;

    @DynamoDBHashKey(attributeName = "key")
    public String getKey() { return key; }

    @DynamoDBAttribute(attributeName = "foo")
    public String getFoo() { return foo; }

    @DynamoDBAttribute(attributeName = "bar")
    public List<String> getBar() {  return bar; }

    // ...
}

Using only the AWS SDK I would simply do something like this:

DynamoDBMapper mapper = new DynamoDBMapper(client);
mapper.save(myDataItem);

The aws2-ddb component however requires the item as a Map<String, AttributeValue> .

Question

How can I transform the annotated class to Map<String, AttributeValue> ? It feels like this should be something obvious but I seem to be unable to find anything in the AWS SDK.

(As I workaround I could implement the above DynamoDBMapper code in a custom processor, but I'd prefer to use the component.)

Answer 1

Unof.netelly during the camel-aws-ddb lib drill down, I found no possibility to use DynamoDbMapper. Basically, the aws-dbb / aws2-dbb components use DdbProducer under the hood which in fact is a Processor calling a ddbClient putItem in your case.

The possible options are:

• Writing your own component using of DynamoDBMapper instead of pure ddbClient .
• A custom processor as you've mentioned above by setting an item in the header (or even bean if you don't have to deal with the message itself).
• Just using the current API which allows the use of items of type List<Map<String, AttributeValue>> putting them in the message header in the end.