liubao68 commented on issue #2187:
URL:
https://github.com/apache/servicecomb-java-chassis/issues/2187#issuecomment-757581019
这个异常结合代码不应该抛出，你可以看下 ResponseMapperFactorys 代码：
```
public MAPPER createResponseMapper(Type providerType) {
for (ResponseMapperFactory<MAPPER> factory : factorys) {
if (!factory.isMatch(providerType)) {
continue;
}
return factory.createResponseMapper(this, providerType);
}
throw new IllegalStateException(
String.format("can not find response mapper for %s, this should
never happened.",
providerType.getTypeName()));
}
```
`DefaultProducerResponseMapperFactory` 可以保证永远不会走到异常分支。 你可以调试下代码，看看实际情况。
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