Java 无法将消息从Json字符串转换为对象。类卡斯特例外

我使用的是SpringXD，其中有一个带有outputType application/json的兔子源代码。下一个模块接收它并将其转换为Java对象。RabbitMq是我的运输巴士

我的配置非常标准，如：

@EnableIntegration
@ImportResource("classpath:some.xml")
@ComponentScan(basePackages = "com.something")
public class MyConfigClass {

    @Autowired
    private Jackson2JsonObjectMapper jackson2JsonObjectMapper;  


    @Bean
    public MessageChannel input() {
        return new DirectChannel();
    }

    @Bean
    public MessageChannel inputObject() {
        return new DirectChannel();
    }  

    @Bean
    public MessageChannel output() {
        return new DirectChannel();
    }

    @Bean
    public MessageChannel outputObject() {
        return new DirectChannel();
    }

    @Bean
    public Jackson2JsonObjectMapper objectMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.registerModule(new JodaModule());
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        return new Jackson2JsonObjectMapper(mapper);
    }

    @Bean
    @Transformer(inputChannel = "input", outputChannel = "inputObject")
    public JsonToObjectTransformer jsonToObjectTransformer() {
        return new JsonToObjectTransformer(someTargetClass.class, jackson2JsonObjectMapper);
    }

    @Bean
    @Transformer(inputChannel = "outputObject", outputChannel = "output")
    public ObjectToJsonTransformer objectToJsonTransformer() {
        return new ObjectToJsonTransformer(jackson2JsonObjectMapper);
    }
}

然后在另一节课上，我有这样的东西：

public class AnotherClass {


    @Transformer(inputChannel = "inputObject", outputChannel = "outputObject")
    public Message<someTargetClass> transform(Message<someTargetClass> incoming) {

        //Here I'm getting Caused by: org.springframework.messaging.MessageHandlingException: nested exception is java.lang.ClassCastException: java.lang.String cannot be cast to com.whatever.someTargetClass

        SomeTargetClass messagePayload = incoming.getPayload();
    }
} 

---

因此，不知何故，通过通道的流量似乎无法正常工作。我遗漏了什么？

我的理论是，当转换器接收到字符串时，源代码正在生成一个字符串，即json没有被传输，因此无法将其转换为SomeTargetClass。如果这是真的，那么应该修复它：

在变换方法更改中：

SomeTargetClass messagePayload=incoming.getPayload

致：

这是使用小杰克逊，但我相信你可以在杰克逊找到替代者

Caused by: org.springframework.messaging.MessageHandlingException: nested exception is java.lang.ClassCastException: java.lang.String cannot be cast to com.whatever.someTargetClass
at org.springframework.integration.handler.MethodInvokingMessageProcessor.processMessage(MethodInvokingMessageProcessor.java:96) ~[spring-integration-core-4.2.5.RELEASE.jar:na]
at org.springframework.integration.transformer.AbstractMessageProcessingTransformer.transform(AbstractMessageProcessingTransformer.java:90) ~[spring-integration-core-4.2.5.RELEASE.jar:na]
at org.springframework.integration.transformer.MessageTransformingHandler.handleRequestMessage(MessageTransformingHandler.java:89) ~[spring-integration-core-4.2.5.RELEASE.jar:na]
... 52 common frames omitted

String jsonString = incoming.getPayload();
SomeTargetClass messagePayload = (SomeTargetClass) JSON.std.beanFrom(SomeTargetClass.class, jsonString);