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ペイロード形式としてJSONを使用して、 SpringのRestTemplateを使用してChargifyAPIを使用しています。非常にスムーズに進んでいますが、オブジェクトの配列をGETしようとすると、惨めに失敗します。たとえば、次のことを考慮してください。

Transaction[] transactions = restTemplate.getForObject(
        CHARGIFY_ENDPOINT + "/subscriptions/{subscription}/transactions.json",
        Transaction[].class,
        subscriptionId
    );

実際のGETは正常に実行され、JSON応答は次のようになります。

[ { "transaction" : { "amount_in_cents" : 3006,
    "created_at" : "2012-06-17T16:32:05-04:00",
    "ending_balance_in_cents" : 0,
    "id" : 17283728,
    "kind" : null,
    "memo" : "",
    "payment_id" : null,
    "product_id" : 120387,
    "subscription_id" : 1947292,
    "success" : true,
    "transaction_type" : "payment",
    "type" : "Payment"
      } },
  { "transaction" : { "amount_in_cents" : 5900,
    "created_at" : "2012-06-17T16:32:05-04:00",
    "ending_balance_in_cents" : 3006,
    "id" : 17283727,
    "kind" : "baseline",
    "memo" : "Professional Plan (06/17/2012 - 07/17/2012)",
    "payment_id" : 17283728,
    "product_id" : 120387,
    "subscription_id" : 1947292,
    "success" : true,
    "transaction_type" : "charge",
    "type" : "Charge"
      } },
  { "transaction" : { "amount_in_cents" : -2894,
    "created_at" : "2012-06-17T16:32:03-04:00",
    "ending_balance_in_cents" : -2894,
    "id" : 17283726,
    "kind" : "prorated",
    "memo" : "",
    "payment_id" : null,
    "product_id" : 120387,
    "subscription_id" : 1947292,
    "success" : null,
    "transaction_type" : "adjustment",
    "type" : "Adjustment"
      } },
  { "transaction" : { "amount_in_cents" : 2900,
    "created_at" : "2012-06-17T15:17:07-04:00",
    "ending_balance_in_cents" : 0,
    "id" : 17281084,
    "kind" : null,
    "memo" : "",
    "payment_id" : null,
    "product_id" : 120386,
    "subscription_id" : 1947292,
    "success" : true,
    "transaction_type" : "payment",
    "type" : "Payment"
      } },
  { "transaction" : { "amount_in_cents" : 2900,
    "created_at" : "2012-06-17T15:17:06-04:00",
    "ending_balance_in_cents" : 2900,
    "id" : 17281083,
    "kind" : "baseline",
    "memo" : "Standard Plan (06/17/2012 - 07/17/2012)",
    "payment_id" : 17281084,
    "product_id" : 120386,
    "subscription_id" : 1947292,
    "success" : true,
    "transaction_type" : "charge",
    "type" : "Charge"
      } }
]

ただし、JacksonがJSONを逆シリアル化しようとすると、次のようになりますJsonMappingException: Current token not START_OBJECT (needed to unwrap root name 'Transaction[]'), but START_ARRAY。

16:59:12.651 [http-8080-1] DEBUG org.springframework.web.client.RestTemplate - GET request for "https://foobar.chargify.com/subscriptions/1947292/transactions.json" resulted in 200 (OK)
16:59:12.651 [http-8080-1] DEBUG org.springframework.web.client.RestTemplate - Reading [[Lcom.foobar.chargify.Transaction;] as "application/json;charset=utf-8" using [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter@1ea8dbd]
16:59:12.662 [http-8080-1] DEBUG org.apache.http.wire - << "[{"transaction":{"type":"Payment","amount_in_cents":3006,"payment_id":null,"memo":"","id":17283728,"created_at":"2012-06-17T16:32:05-04:00","subscription_id":1947292,"kind":null,"ending_balance_in_cents":0,"success":true,"product_id":120387,"transaction_type":"payment"}},{"transaction":{"type":"Charge","amount_in_cents":5900,"payment_id":17283728,"memo":"Professional Plan (06/17/2012 - 07/17/2012)","id":17283727,"created_at":"2012-06-17T16:32:05-04:00","subscription_id":1947292,"kind":"baseline","ending_balance_in_cents":3006,"success":true,"product_id":120387,"transaction_type":"charge"}},{"transaction":{"type":"Adjustment","amount_in_cents":-2894,"payment_id":null,"memo":"","id":17283726,"created_at":"2012-06-17T16:32:03-04:00","subscription_id":1947292,"kind":"prorated","ending_balance_in_cents":-2894,"success":null,"product_id":120387,"transaction_type":"adjustment"}},{"transaction":{"type":"Payment","amount_in_cents":2900,"payment_id":null,"memo":"","id":17281084,"created_at":"2012-06-17T15:17:07-04:00","subscription_id":1947292,"kind":null,"ending_balance_in_cents":0,"success":true,"product_id":120386,"transaction_type":"payment"}},{"transaction":{"type":"Charge","amount_in_cents":2900,"payment_id":17281084,"memo":"Standard Plan (06/17/2012 - 07/17/2012)","id":17281083,"created_at":"2012-06-17T15:17:06-04:00","subscription_id":1947292,"kind":"baseline","ending_balance_in_cents":2900,"success":true,"product_id":120386,"transaction_type":"charge"}}]"
16:59:12.683 [http-8080-1] DEBUG org.apache.http.impl.conn.SingleClientConnManager - Releasing connection org.apache.http.impl.conn.SingleClientConnManager$ConnAdapter@17ed710
16:59:12.684 [http-8080-1] DEBUG org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver - Resolving exception from handler [public void com.foobar.controllers.TestController.viewTransactions(int)]: org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Current token not START_OBJECT (needed to unwrap root name 'Transaction[]'), but START_ARRAY
 at [Source: org.apache.http.conn.EofSensorInputStream@598a5d; line: 1, column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Current token not START_OBJECT (needed to unwrap root name 'Transaction[]'), but START_ARRAY
 at [Source: org.apache.http.conn.EofSensorInputStream@598a5d; line: 1, column: 1]
16:59:12.686 [http-8080-1] DEBUG org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver - Resolving exception from handler [public void com.foobar.controllers.TestController.viewTransactions(int)]: org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Current token not START_OBJECT (needed to unwrap root name 'Transaction[]'), but START_ARRAY
 at [Source: org.apache.http.conn.EofSensorInputStream@598a5d; line: 1, column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Current token not START_OBJECT (needed to unwrap root name 'Transaction[]'), but START_ARRAY
 at [Source: org.apache.http.conn.EofSensorInputStream@598a5d; line: 1, column: 1]
16:59:12.686 [http-8080-1] DEBUG org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Resolving exception from handler [public void com.foobar.controllers.TestController.viewTransactions(int)]: org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Current token not START_OBJECT (needed to unwrap root name 'Transaction[]'), but START_ARRAY
 at [Source: org.apache.http.conn.EofSensorInputStream@598a5d; line: 1, column: 1]; nested exception is org.codehaus.jackson.map.JsonMappingException: Current token not START_OBJECT (needed to unwrap root name 'Transaction[]'), but START_ARRAY
 at [Source: org.apache.http.conn.EofSensorInputStream@598a5d; line: 1, column: 1]

私は以前ジャクソンと一緒にこの問題に遭遇しました、そして数日間の研究を過ごした後、私は別のルートに行くことになりました。今回はそれは選択肢ではなく、解決策を見つけることができません。

何か案は？List配列を取得するかバックを取得するかは関係ありません。私も運がなかった。

ジャクソンのドキュメントを読んでいる間、私はあなたがリストをラップすることができるはずの場所を見ました、すなわちnew TypeReference<List<Transaction>>()、私はそこでも運がありませんでした。

ところで、ChargifyがJSON応答をフォーマットする方法のために、私のRestTemplateはObjectMapperこれらのオプションを設定するカスタムで構成されています。

configure(SerializationConfig.Feature.WRAP_ROOT_VALUE, true);
configure(DeserializationConfig.Feature.UNWRAP_ROOT_VALUE, true);

これらのオプションを削除すると、noJsonMappingExceptionはスローされますが、結果のTransactionオブジェクトのすべてのフィールドはnullになります。

このオプションも追加しようとしましたが、役に立たないようです。

configure(DeserializationConfig.Feature.USE_JAVA_ARRAY_FOR_JSON_ARRAY, true);
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1 に答える 1

3

トランザクションの上に別のラッパー タイプが必要なだけです。UNWRAP_ROOT_VALUE オプションも削除してください。

クラスは次のようになります。

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;
...
}

サンプルjsonを使用すると、次のことがきれいに機能します。

ObjectMapper mapper = new ObjectMapper();
InputStream is = this.getClass().getResourceAsStream("sample.json");
TransactionHolder[] holders = mapper.readValue(is,TransactionHolder[].class);
于 2012-06-20T21:16:20.657 に答える