Question 18623 in Amazon Web Sevices Question posted in
The official Amazon Web Services documentation can be found here.

How can you serialize/deserialize AWS Java SDK V2 classes into/from JSON? – Amazon Web Sevices

With the AWS Java SDK V1, all of the classes were normal POJOs with standard getters and setters, so using Jackson you could just serialize/deserialize them easily.

Example:

TaskDefinition taskDefinition = ecsClient.describeTaskDefinition(new DescribeTaskDefinitionRequest().withTaskDefinition("myTaskDefinition")).getTaskDefinition();
System.out.println(new ObjectMapper().writeValueAsString(taskDefinition));

Result:

{"taskDefinitionArn":"...","containerDefinitions":[...]}

But when I try this same thing with the AWS Java SDK V2, it results in an empty JSON object.

Example:

TaskDefinition taskDefinition = ecsClient.describeTaskDefinition(DescribeTaskDefinitionRequest.builder().taskDefinition("myTaskDefinition").build()).taskDefinition();
System.out.println(new ObjectMapper().writeValueAsString(taskDefinition));

Result:

{}

And when I try to deserialize using Jackson, it results in an error:

Cannot construct instance of `software.amazon.awssdk.services.ecs.model.TaskDefinition` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I think the answer is given here: https://github.com/aws/aws-sdk-java-v2/issues/2254

    To serialize:

    String taskDefinitionJson = new ObjectMapper().writeValueAsString(
        taskDefinition.toBuilder());

    To deserialize:

    TaskDefinition taskDefinition = new ObjectMapper().readValue(
        taskDefinitionJson,
        TaskDefinition.serializableBuilderClass())
    .build();

  2. 0

    in the docs, there is a method called serializableBuilderClass()

    Try using that. I’d imagine the code would be something like:

    TaskDefinition.serializableBuilderClass().build()
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