[GitHub] [rocketmq-spring] einsitang commented on issue #561: onMessage ClassCastException in abstract class implements RocketMQListener

["einsitang (via GitHub)" <gi...@apache.org>]

einsitang commented on issue #561:
URL: https://github.com/apache/rocketmq-spring/issues/561#issuecomment-1563394999

   你的问题应该就是`doConvertMessage(messageExt)`没有找到正确的反序列化方法，所以识别成LinkHashMap，之后调用你的`BaseStringMQListener.onMessage` 方法，所以就报转换错误
   ```
   java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to java.lang.String
   at com.evatmaster.biz.center.order.listener.BaseStringMQListener.onMessage(BaseStringMQListener.java:9)
   ```
   你的message信息是：{"orderId":1659164170366488577,"systemType":"00"}
   发送的时候明确转换成json string则应该是："{\"orderId\":1659164170366488577,\"systemType\":\"00\"}"
   那么他就可以识别了。
   
   不过奇怪的是，为什么行号是错误的 `BaseStringMQListener.java:9`


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