aaab456 opened a new issue #604:
URL: https://github.com/apache/rocketmq-client-go/issues/604
```go
rlog.SetLogger(replacelog.NewLogger())
```
I replace logger with json formatter and get the output msg of log like this
```json
{"msg":"query topic route from server error", "fields":{"underlayError":{}}}
```
In fact, the error of "underlayError" structure is not nil, if we use
err.Error(), it will print out specific information
print the empty structure of error makes it difficult to locate the problem
link:
https://stackoverflow.com/questions/44989924/golang-error-types-are-empty-when-encoded-to-json
example
> github.com/apache/rocketmq-client-go/[email protected]/internal/route.go:134
```go
if err != nil {
rlog.Warning("query topic route from server error",
map[string]interface{}{
rlog.LogKeyUnderlayError: err, // <-- rlog.LogKeyUnderlayError:
err.Error(),
})
}
```
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