com.fasterxml.jackson.databind.exc.mismatchedinputexception：无法对类型的值进行`com.com.company.fruitslist＆＃x27;从阵列值（令牌＆＃x27; jsontok

Question

我刚刚开始在Java进行编码，所以这个问题听起来很愚蠢。

目标： 我正在尝试构建一个使用Apache Camel路由的Quarkus Rest应用程序，该应用程序具有邮政方法。 The goal is to take an array of fruits as input and add additional information and return it back to the calling application

Input which is being passed to Quarkus Application http://localhost:8080/simple through POSTMAN

[{
    "id": 1,
    "name": "one"
},{
    "id": 2,
    "name": "second"
}]

<强>问题： 每当我尝试通过HTTP客户端（Postman）调用其余端点时，我会遇到错误。下面的堆栈跟踪

可以帮助我确定我做错了什么？

{
  "details": "Error id 0fd95541-edf3-443a-9e56-261400017f01-15, com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `com.company.FruitsList` from Array value (token `JsonToken.START_ARRAY`)",
  "stack": "com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `com.company.FruitsList` from Array value (token `JsonToken.START_ARRAY`)\n at [Source: (ByteArrayInputStream); line: 1, column: 1]\r\n\tat com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)\r\n\tat com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1741)\r\n\tat com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1515)\r\n\tat com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1462)\r\n\tat com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeFromArray(BeanDeserializer.java:638)\r\n\tat com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:210)\r\n\tat com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:186)\r\n\tat com.fasterxml.jackson.databind.deser.DefaultDeserializationContext.readRootValue(DefaultDeserializationContext.java:322)\r\n\tat com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:2051)\r\n\tat com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1427)\r\n\tat com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1442)\r\n\tat org.apache.camel.component.jackson.AbstractJacksonDataFormat.unmarshal(AbstractJacksonDataFormat.java:188)\r\n\tat org.apache.camel.support.processor.UnmarshalProcessor.process(UnmarshalProcessor.java:64)\r\n\tat org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)\r\n\tat org.apache.camel.support.AsyncProcessorSupport.process(AsyncProcessorSupport.java:41)\r\n\tat org.apache.camel.processor.RestBindingAdvice.unmarshal(RestBindingAdvice.java:307)\r\n\tat org.apache.camel.processor.RestBindingAdvice.before(RestBindingAdvice.java:142)\r\n\tat org.apache.camel.processor.RestBindingAdvice.before(RestBindingAdvice.java:51)\r\n\tat org.apache.camel.impl.engine.CamelInternalProcessor.process(CamelInternalProcessor.java:341)\r\n\tat org.apache.camel.component.platform.http.vertx.VertxPlatformHttpConsumer.lambda$handleRequest$2(VertxPlatformHttpConsumer.java:185)\r\n\tat io.vertx.core.impl.ContextImpl.lambda$null$0(ContextImpl.java:159)\r\n\tat io.vertx.core.impl.AbstractContext.dispatch(AbstractContext.java:100)\r\n\tat io.vertx.core.impl.ContextImpl.lambda$executeBlocking$1(ContextImpl.java:157)\r\n\tat org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)\r\n\tat org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)\r\n\tat org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)\r\n\tat org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)\r\n\tat org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)\r\n\tat io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)\r\n\tat java.base/java.lang.Thread.run(Thread.java:830)"

这是我的路由代码：

package com.company;

import org.apache.camel.LoggingLevel;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.model.rest.RestBindingMode;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.enterprise.context.ApplicationScoped;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.List;

@ApplicationScoped
public class RouteBuild extends RouteBuilder {

  Logger logger = LoggerFactory.getLogger(RouteBuild.class);

  @Override
  public void configure() throws Exception {

    restConfiguration().component("platform-http").bindingMode(RestBindingMode.auto);

    rest("/simple")
      .post()
      .type(FruitsList.class)
      .outType(AddressRequest.class)
      .route()
      .routeId("New Route")
      .log(LoggingLevel.INFO, "Passing input data to Direct Component for further actions")
      .to("direct:directDataEntry");

    from("direct:directDataEntry")
      .unmarshal().json()
      .log(LoggingLevel.INFO, "Inside the route to validate the data structure of the input")
      .log(LoggingLevel.INFO, "data of input is ${body}")
      .to("direct:directDataEntry1");

    from("direct:directDataEntry1")
      .routeId("validateData")
      //.log(LoggingLevel.INFO,"Passing input data to validate in route \"validationData\"")
      .process(new Processor() {
        @Override
        public void process(Exchange exchange) throws Exception {

          AddressRequest addressRequest = new AddressRequest();
          addressRequest.setCity("Atlanta");
          addressRequest.setInput_id("1");
          addressRequest.setState("GA");
          addressRequest.setStreet(exchange.getIn().getBody(FruitsList.class).getFruitsList().get(0).getName());
          exchange.getIn().setBody(addressRequest);
   }
      });

  }
}

以下是Fruitslist，Fruits和AddressRequest类代码（POJO）

水果

package com.company;

public class Fruits {

  public Fruits() {}
  private int id;
  private String name;

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
}

。Classfruitslist.class

package com.company;

import java.util.List;

public class FruitsList {

    private List<Fruits> fruitsList;
    public FruitsList(){
    }
    public List<Fruits> getFruitsList() {
        return fruitsList;
    }
    public void setFruitsList(List<Fruits> fruitsList) {
        this.fruitsList = fruitsList;
    }
}

Answer 1

预期的输入类型为fruitslist，它是包含数组的对象。您正在尝试传递fruits的数组，这是无效的。

您可以将JSON输入修改为：

{
   "fruitsList":[
      {
         "id":1,
         "name":"one"
      },
      {
         "id":2,
         "name":"second"
      }
   ]
}