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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