Lombok Annotations with DynamoDB annotations

Question

I have a DAO like:

    @Getter
    @Setter
    @DynamoDBTable(tableName="tableName")
    public class DAO {
        @DynamoDBHashKey
        private String field1;

        @DynamoDBIndexHashKey(globalSecondaryIndexName="index_name")
        @DynamoDBRangeKey
        private String field2;
    }

Problem is when I am trying to use the DAO to make a load call using DynamoDBMapper with field1 as the hash key to obtain the item, it throws a DynamoDBException saying: Null key found for public DAO.getField2() but actually table has value corresponding to field2. Question, is this because of Lombok annotation instead of the manual mutator code and or in general we use Lombok and DynamoDBAnnotations together?

Answer 1

Here is a little more of an explanation and a TL;DR

You are calling the load method, which is mapped to the GetItem call. The DynamoDBMapper is trying to map that request based on your annotations. Your class has the @DynamoDBRangeKey annotation, and the GetItem call needs the full primary key to get the item, which means that the mapper will build out the primary key for the object.

Since Lombok has already generated your code (before runtime), it is not affecting the annotations you have already placed. And also since your annotations are on the fields rather than applying them to the getters, the mapper it is calling the generated Lombok getter. When it tries to serialize into a request, however, that getter is returning null because you have only set the hashKey.

TL;DR: load() translates to GetItem API which requires both the hashKey and the rangeKey since both annotations are present on your class.