bijukunjummen / aws-sdk2-dynamo-json-helper

Java Library to convert a Jackson JsonNode to AWS SDK 2 AttributeValue and back

Jackson JsonNode to AWS SDK 2 AttributeValue

This is a small java library that provides a utility method to convert a Jackson JsonNode to an AWS SDK 2.x AttributeValue and back.

Using the library:

Add a dependency, for eg. with gradle:

implementation("com.github.bijukunjummen:aws-sdk2-dyanamo-json-helper:$VERSION")

Now, in the code, given a json which looks like this:

{
  "key1": "value1",
  "key2": [
    "arr1",
    "arr2"
  ],
  "level1": {
    "level2": {
      "level3": {
        "l3Key": "l3Value"
      }
    }
  }
}

The Json can be converted to an AttributeValue the following way:

JsonNode jsonNode = objectMapper.readTree(json);
AttributeValue dataAttributeValue = JsonAttributeValueUtil.toAttributeValue(jsonNode);

The utility recurses the json structure and creates the nested AttributeValue structure.

Once it is saved to dynamoDB, after retrieving the content, it can be converted back to a json the following way:

AttributeValue attributeValue = response.item().get("data");
JsonNode dataJsonNode = JsonAttributeValueUtil.fromAttributeValue(attributeValue);