@Header批註不按預期方式工作

Question

我正在開發Spring集成項目（1.0.2），無法使@Header批註生效。

這裏是我的服務激活：

@Component 
public class MyTransformer { 
    @ServiceActivator(inputChannel = "inChannel", outputChannel = "outChannel") 
    public String transform(final Message<?> message, 
          @Header(value = "eventId") final Long id, 
          @Header(value = "error", required = false) final Throwable throwable) { 
     return throwable == null 
       ? "event [" + eventId +"]" 
       : "event [" + eventId +"] error: " + throwable.getMessage(); 
    } 
} 

這裏的錯誤消息：

Caused by: java.lang.IllegalArgumentException: Wrong number of arguments. Expected types {class java.lang.Object, class java.lang.Long, class java.lang.Throwable}, but received values {[Payload=parp][Headers={eventId=888Foo, error=java.lang.IllegalArgumentException: Invalid message content parp, springintegration_timestamp=1277803938244, springintegration_id=726d0769-bd27-4d95-a9ea-640c1f807065}]}. 
    at org.springframework.integration.util.DefaultMethodInvoker.invokeMethod(DefaultMethodInvoker.java:71) 
    at org.springframework.integration.handler.MessageMappingMethodInvoker.doInvokeMethod(MessageMappingMethodInvoker.java:160) 
    at org.springframework.integration.handler.MessageMappingMethodInvoker.invokeMethod(MessageMappingMethodInvoker.java:107) 
    at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:49) 
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:91) 
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:59) 

我在做什麼錯？

Answer 1

當然，事件ID應該是一個字符串，而不是一個長。

修復它。