JsonMappingException: Current token not START_OBJECT (needed to unwrap root name 'Transaction[]'), but START_ARRAY

Question

I\'m using Spring\'s RestTemplate to consume the Chargify API, using JSON as the payload format. It has been going pretty smoothly, however when I try to GET an array of obj

Answer 1

You just need another wrapper type on top of Transaction, also please remove the UNWRAP_ROOT_VALUE option.

The classes will be along these lines:

public class TransactionHolder {
    private Transaction transaction;
... 
}

public class Transaction {
    private String amount_in_cents;
    private String created_at;
    private int ending_balance_in_cents;
    private int id;
    private String kind;
    private String memo;
    private int payment_id;
    private int product_id;
    private int subscription_id;
    private boolean success;
    private String transaction_type;
    private String type;
...
}

With your sample json, the following works for me cleanly:

ObjectMapper mapper = new ObjectMapper();
InputStream is = this.getClass().getResourceAsStream("sample.json");
TransactionHolder[] holders = mapper.readValue(is,TransactionHolder[].class);