Apache Camel 的 JsonMappingException

Question

我在使用骆驼路线时遇到异常

Caused by: com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.apache.camel.converter.stream.InputStreamCache and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:284)
    at com.fasterxml.jackson.databind.SerializerProvider.mappingException(SerializerProvider.java:1110)
    at com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1135)
    at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:69)
    at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:32)
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:292)
    at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1429)
    at com.fasterxml.jackson.databind.ObjectWriter._configAndWriteValue(ObjectWriter.java:1158)

骆驼路线：

restConfiguration().producerComponent("http4").host("localhost").port(9080);


    from("direct:getSubscriptions")
        .hystrix()
        .to("rest:get:testendpoint?carrier={carrier}&flightNumber={flightNumber}&origin={origin}&destination={destination}&date={date}")
        .log(">> - ${body}")
        .marshal().json(JsonLibrary.Jackson)
        .split().jsonpathWriteAsString("$.[1]", true)
        .log("${body}");

不确定我做的是否正确？任何建议将不胜感激

Answer 1

在将其编组为 json 之前将您的正文转换为字符串。您可以在元帅之前添加 .convertBodyTo(String.class)。问题是您正在发送一个流，而杰克逊不知道如何序列化它。

Answer 2

您需要将这样的 jacksonConfig 添加到您的项目中，而不是将 body 转换为字符串：

@Configuration
public class JacksonConfig {

    @Bean
    public ObjectMapper objectMapper() {

        ObjectMapper objectMapper = new ObjectMapper();
        ...
        objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
        ...

        return objectMapper;
    }
}

Apache Camel 的 JsonMappingException

JsonMappingException with Apache Camel

json

split

apache-camel

spring-camel