Building a POJO to parse this JSON using Jackson

I'm working with Jackson for JSON serialization. Normally the structures I get back are named and are pretty easy to deal with, yet I've run into one I can't quite get a POJO built for that will work. Any suggestions on how to parse the following into a set POJOs?

JSON:

[
{
    "transaction":
    {
        "accountType":"type",
        "action":"A",
        "created_at":"2011-08-16T17:41:48Z",
        "id":1,
        "sbAccountId":5,
        "updated_at":"2011-08-16T17:41:48Z",
        "userId":"1234",
        "userName":"userName"
    }
},
{
    "transactio开发者_如何学编程n":
    {
        "accountType":"type",
        "action":"A",
        "created_at":"2011-08-16T17:41:48Z",
        "id":1,
        "sbAccountId":5,
        "updated_at":"2011-08-16T17:41:48Z",
        "userId":"1234",
        "userName":"userName"
    }
}
]

POJO:

@JsonIgnoreProperties(ignoreUnknown=true)
public class TransactionShell
{
    private SbAccount transaction;

    public TransactionShell() {}

    public SbAccount getTransaction() {
        return transaction;
    }

    public void setTransaction(SbAccount transaction) {
        this.transaction = transaction;
    }
}

Deserialize call:

List<TransactionShell> transactions = Common.mapper.readValue(responseBody, new TypeReference<List<TransactionShell>>() {});