Java Jackson:无法反序列化com.org.my_services.external_services.ifs.converter.InventoryPricePayload的实例超出启动_数组令牌

我试图消耗的有效载荷看起来像

我有一个类列表，这些类应该映射到上面的JSON负载

存货价格有效载荷

最后将价格数据作为

我试着像这样测试这个

final ObjectMapper mapper = new ObjectMapper();
        try {
            final InventoryPricePayload inventoryPricePayload = mapper.readValue(new File(getClass().getResource("/getInventoryAndPrice.json").getPath()), InventoryPricePayload.class);
            System.out.println(inventoryPricePayload);
        } catch (final IOException e) {
           throw new RuntimeException("can not read resource :" + e.getMessage());
        }

我得到的失败如下：

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.742 sec <<< FAILURE! - in com.org.my_services.external_services.ifs.IFSManagerTest
testMockIfsClient(com.org.my_services.external_services.ifs.IFSManagerTest)  Time elapsed: 0.615 sec  <<< ERROR!
java.lang.RuntimeException: can not read resource :Can not deserialize instance of com.org.my_services.external_services.ifs.converter.InventoryPricePayload out of START_ARRAY token
 at [Source: /Users/harith/IdeaProjects/my_services/external_services/ifs/target/test-classes/getInventoryAndPrice.json; line: 1, column: 1]
    at com.org.my_services.external_services.ifs.MockIfsClient.getInventoryAndPrice(MockIfsClient.java:25)
    at com.org.my_services.external_services.ifs.IFSManager.getInventoryAndPrice(IFSManager.java:20)
    at com.org.my_services.external_services.ifs.IFSManagerTest.testMockIfsClient(IFSManagerTest.java:28)

问题:

我到底在哪里搞砸了？

根据Jackson see数据绑定与泛型，我做了以下工作，一切顺利

final List<InventoryPriceDetail> inventoryPriceDetails= mapper.readValue(new File(getClass().getResource("/getInventoryAndPrice.json").getPath()), new TypeReference<List<InventoryPriceDetail>>() {});

而不是使用

新类型引用{}

这有点难看，因为您还可以使用类实现

---

mapper.getTypeFactory.ConstructionCollectionTypeList.class，InventoryPriceDetail.class

个人意见：TypeReference使构造更具可读性。@daydreamer我想这是一个意见问题：

final ObjectMapper mapper = new ObjectMapper();
        try {
            final InventoryPricePayload inventoryPricePayload = mapper.readValue(new File(getClass().getResource("/getInventoryAndPrice.json").getPath()), InventoryPricePayload.class);
            System.out.println(inventoryPricePayload);
        } catch (final IOException e) {
           throw new RuntimeException("can not read resource :" + e.getMessage());
        }

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.742 sec <<< FAILURE! - in com.org.my_services.external_services.ifs.IFSManagerTest
testMockIfsClient(com.org.my_services.external_services.ifs.IFSManagerTest)  Time elapsed: 0.615 sec  <<< ERROR!
java.lang.RuntimeException: can not read resource :Can not deserialize instance of com.org.my_services.external_services.ifs.converter.InventoryPricePayload out of START_ARRAY token
 at [Source: /Users/harith/IdeaProjects/my_services/external_services/ifs/target/test-classes/getInventoryAndPrice.json; line: 1, column: 1]
    at com.org.my_services.external_services.ifs.MockIfsClient.getInventoryAndPrice(MockIfsClient.java:25)
    at com.org.my_services.external_services.ifs.IFSManager.getInventoryAndPrice(IFSManager.java:20)
    at com.org.my_services.external_services.ifs.IFSManagerTest.testMockIfsClient(IFSManagerTest.java:28)

final List<InventoryPriceDetail> inventoryPriceDetails= mapper.readValue(new File(getClass().getResource("/getInventoryAndPrice.json").getPath()), new TypeReference<List<InventoryPriceDetail>>() {});