java.lang.ClassCastException：java.util.LinkedHashMap无法转换为com.testing.models.Account

我收到以下错误：

java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.testing.models.Account

用下面的代码

final int expectedId = 1;

Test newTest = create();

int expectedResponseCode = Response.SC_OK;

ArrayList<Account> account = given().when().expect().statusCode(expectedResponseCode)
    .get("accounts/" + newTest.id() + "/users")
    .as(ArrayList.class);
assertThat(account.get(0).getId()).isEqualTo(expectedId);

我有什么理由做不到吗get(0)?

这个问题来自杰克逊。当它没有足够的信息来了解要反序列化到哪个类时，它会使用LinkedHashMap.

由于您没有告知杰克逊您的元素类型ArrayList，它不知道您想要反序列化为ArrayList of Accounts。所以它会恢复到默认值。

相反，你可能可以使用as(JsonNode.class)，然后处理ObjectMapper以比安心所允许的更丰富的方式。像这样的东西：

ObjectMapper mapper = new ObjectMapper();

JsonNode accounts = given().when().expect().statusCode(expectedResponseCode)
    .get("accounts/" + newClub.getOwner().getCustId() + "/clubs")
    .as(JsonNode.class);


//Jackson's use of generics here are completely unsafe, but that's another issue
List<Account> accountList = mapper.convertValue(
    accounts, 
    new TypeReference<List<Account>>(){}
);

assertThat(accountList.get(0).getId()).isEqualTo(expectedId);