Json解析错误无法反序列化'java.util.ArrayList'的实例，该实例超出了START\u对象标记

我有以下控制器，我正试图测试与邮递员

public ResponseEntity<List<OldTransactionEntity>> createTransaction(@Valid @RequestBody List<OldTransactionNewDto> newDtos) {
        return ResponseEntity.ok(transactionService.createTransactions(newDtos));
    }

我在Postman中构建的json请求是

{
    "amount" : 234,
    "depositConfirmationNumber" : 23,
    "transactionDate" : "2020-03-18",
    "type" : "DEPOSIT",
    "lenderId" : 2332,
    "associatedAccountNumber" : 32425,
    "fileRequestId" : 321,
    "transferNotes" : "note",
    "confirmationTime" : "2020-03-18",
    "liquefied" : 23412,
    "isNotifiedNotInvested" : false,
    "giTransactionId" : "245",
    "transferId" : 324,
    "originalTransactionRequestId" : 23,
    "isInitialApproved" : true,
    "parentBankAccount" : [
        {
            "userId" : 1,
            "bankAccountNumber" : 2,
            "bankNumber" : 123,
            "bankBranchNumber" : 2341,
            "bankDetails" : "details",
            "freeText" : "Free text"
        }],
    "childBankAccount" : [
        {
            "userId" : 1,
            "bankAccountNumber" : 2,
            "bankNumber" : 123,
            "bankBranchNumber" : 2341,
            "bankDetails" : "details",
            "freeText" : "Free text"
        }]  
}

---

我得到了不匹配的hinPutException JSON解析错误：无法反序列化

java.util.ArrayList的实例

，因此可能是因为我需要提供旧TransactionWDTOS列表

您正在将对象反序列化为

ArrayList

？它不应该反序列化为

对象吗？看起来您需要将您的对象包装在
列表中
，然后将其传递出去。@polywhill先生，我不确定您在问什么，或者是什么问题。我只想从Postman中找到这个端点，并提供该端点所需的正确json结构wants@GeorgiMichev在java类中，您有一个简单的对象BankAccountNewDto，但在json中，您将作为BankAccountNewDto数组传递。看一看：@MatheusRambo确实这也是一个问题-修复了它，但我仍然在第1行第1列中得到了错误，我得到了它。我看到您的控制器需要一个OldTransactionNewDto数组，而您的json请求正在传递它的单个对象。
{
    "amount" : 234,
    "depositConfirmationNumber" : 23,
    "transactionDate" : "2020-03-18",
    "type" : "DEPOSIT",
    "lenderId" : 2332,
    "associatedAccountNumber" : 32425,
    "fileRequestId" : 321,
    "transferNotes" : "note",
    "confirmationTime" : "2020-03-18",
    "liquefied" : 23412,
    "isNotifiedNotInvested" : false,
    "giTransactionId" : "245",
    "transferId" : 324,
    "originalTransactionRequestId" : 23,
    "isInitialApproved" : true,
    "parentBankAccount" : [
        {
            "userId" : 1,
            "bankAccountNumber" : 2,
            "bankNumber" : 123,
            "bankBranchNumber" : 2341,
            "bankDetails" : "details",
            "freeText" : "Free text"
        }],
    "childBankAccount" : [
        {
            "userId" : 1,
            "bankAccountNumber" : 2,
            "bankNumber" : 123,
            "bankBranchNumber" : 2341,
            "bankDetails" : "details",
            "freeText" : "Free text"
        }]  
}