tiger822 opened a new issue #9847:
URL: https://github.com/apache/dubbo/issues/9847
### Environment
* Dubbo version: 3.0.3
* Operating System version: windows10
* Java version: 11
### Steps to reproduce this issue
1. 我定义了一个返回类型 ResponseEntity
public class ResponseEntity<T> extends LinkedHashMap<String,Object>
implements Serializable {...}
@Override
public ResponseEntity<String> sayHello(String a) {
return ResponseEntity.fromResult(0,a);
}
那么启动时会报错，org.apache.dubbo.metadata.definition.builder.MapTypeBuilder#build，if
(actualTypeArgsLength != 2) {。。。}
不明白为什么要写死
2.如果我将ResponseEntity改为2目：
public class ResponseEntity<T,Object> extends LinkedHashMap<String,Object>
implements Serializable {...}
@Override
public ResponseEntity<String,Object> sayHello(String a) {
return ResponseEntity.fromResult(0,a);
}
...这样就可以，这算是一个bug么？ 我看21年的时候有人提出过，但新版本也没改善。
### Expected Behavior
<!-- What do you expect from the above steps？-->
### Actual Behavior
<!-- What actually happens? -->
If there is an exception, please attach the exception trace:
```
Just put your stack trace here!
Caused by: java.lang.IllegalArgumentException: [ServiceDefinitionBuilder]
Map type [com.freestyle.common.models.ResponseEntity<java.lang.String>] with
unexpected amount of arguments [[Ljava.lang.reflect.Type;@3c1f2651].[class
java.lang.String]
at
org.apache.dubbo.metadata.definition.builder.MapTypeBuilder.build(MapTypeBuilder.java:56)
at
org.apache.dubbo.metadata.definition.TypeDefinitionBuilder.build(TypeDefinitionBuilder.java:56)
at
org.apache.dubbo.metadata.definition.TypeDefinitionBuilder.build(TypeDefinitionBuilder.java:80)
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