在 Java 中解析 Json -> INCLUDE_SOURCE_IN_LOCATION` 已禁用

Question

我有这个 Json：

[
    {
        "Title": "New Moon in Sagittarius",
        "eventStartDate": "01/12/2024",
        "eventEndDate": "01/12/2024"
    },
    {
        "Title": "Christmas",
        "eventStartDate": "25/12/2024",
        "eventEndDate": "25/12/2024"
    },
    {
        "Title": "New Year's Eve",
        "eventStartDate": "31/12/2024",
        "eventEndDate": "31/12/2024"
    }
]

但是当我解析它时：

ObjectMapper objectMapper = new ObjectMapper();
            objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
            objectMapper.setDateFormat(new StdDateFormat().withLenient(false));

           

            // Convert JSON string to Wrapper Class
            AstronomicalEventsWrapper wrapper = objectMapper.readValue
                    (jsonString, AstronomicalEventsWrapper.class);

我有这个错误：

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `com.systicblanets.model.AstronomicalEventsWrapper` from Array value (token `JsonToken.START_ARRAY`)
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); line: 1, column: 1]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1767)
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1541)
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1488)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeFromArray(BeanDeserializer.java:656)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:211)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:187)
    at com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:342)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4899)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3846)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3814)
    at com.mysticplanets.schedulingtasks.CreateAstronomicalEventTask.sendMessage(CreateAstronomicalEventTask.java:60)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at java.base/java.lang.reflect.Method.invoke(Method.java:580)
    at org.springframework.scheduling.support.ScheduledMethodRunnable.runInternal(ScheduledMethodRunnable.java:130)
    at org.springframework.scheduling.support.ScheduledMethodRunnable.lambda$run$2(ScheduledMethodRunnable.java:124)
    at io.micrometer.observation.Observation.observe(Observation.java:499)
    at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:124)
    at org.springframework.scheduling.config.Task$OutcomeTrackingRunnable.run(Task.java:83)
    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
    at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:358)
    at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
    at java.base/java.lang.Thread.run(Thread.java:1583)

Answer 1

根据Jackson文档，在生成异常堆栈跟踪时使用

INCLUDE_SOURCE_IN_LOCATION

，因此它与实际的解析错误无关。

我认为解析错误是因为输入是对象数组，因此反序列化的目标必须是数组或集合。即使你的包装器包含一个集合，它仍然是一个对象，并且输入必须是一个对象，这意味着以

'{'

开头