Java: unable to delete dynamodb item value



I am trying to delete a field called “dog” from all of the items that resides on table animals, or that I use the following code:

    Table table= dynamoDB.getTable("animals");
    ScanRequest scanRequest = new ScanRequest().withTableName("animals");
    ScanResult result = client.scan(scanRequest);


    for (Map<String, AttributeValue> item : result.getItems()){

        table.updateItem(new PrimaryKey("<Primary partition key name>", item.get("<Primary partition key name>"),"<Primary sort key name>", item.get("<Primary sort key name>")), 
new AttributeUpdate("dog").delete());

    }

But I am getting:

    Exception in thread "main" java.lang.RuntimeException: value type: class com.amazonaws.services.dynamodbv2.model.AttributeValue
.
.
.
    Caused by: java.lang.UnsupportedOperationException: value type: class com.amazonaws.services.dynamodbv2.model.AttributeValue

What am I doing wrong here?

by the way, I also tried:

   UpdateItemSpec updateItemSpec = new UpdateItemSpec()
                    .withPrimaryKey("<Primary partition key name>", item.get("<Primary partition key name>"),"<Primary sort key name>", item.get("<Primary sort key name>"))
                    .withUpdateExpression("REMOVE dog");
            table.updateItem(updateItemSpec);

But got the same exception. (Also tried DELETE instead of REMOVE)

Answer

I found the solution for the issue, I cant believe I missed it…. Remember kids, its mandatory to look at the actual values when debugging!

So instead of using just:

item.get("<property name>")

You need to explicitly ask for a String like so:

item.get("<property name>").getS()


Source: stackoverflow