Dubbo 2.7.8及以上判断Map类型的逻辑有误

[wilddragon]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: 2.7.8
• Operating System version: Windows/Linux
• Java version: 8u292

Steps to reproduce this issue

1. 创建一个HashMap的子类作为返回类型，但是只有一个泛型参数< T >，继承时HashMap泛型参数填<String,Object>
   class Abc< Str > extends HashMap<String,Object>{
   ....
   }
   这种用法很常见
2. 在dubbo编译成功后，运行时会报错，[ServiceDefinitionBuilder] Map type [{0}] with unexpected amount of arguments [{1}].
3. 此问题毕现。
   MapTypeBuilder.java此处代码建议修改如下：
   即：先判断此类是否实现了Map接口或其子接口，如果实现了，则必须要求有两个泛型参数
   否则，需要检查其父类，并将其父类的泛型参数加入到Cache中来。
   if (actualTypeArgsLength != 2) {
   for (Class c : clazz.getInterfaces()){ if (Map.class.isAssignableFrom(c)){ throw new IllegalArgumentException(MessageFormat.format( "[ServiceDefinitionBuilder] Map type [{0}] with unexpected amount of arguments [{1}]." + Arrays.toString(actualTypeArgs), type, actualTypeArgs)); } } } boolean checkSuper = true; for (Class c : clazz.getInterfaces()){
   if (Map.class.isAssignableFrom(c)){
   checkSuper = false;
   break;
   }
   }
   if (checkSuper) {
   Class<?> cl = clazz.getSuperclass();
   Type t = clazz.getGenericSuperclass();
   build(t, cl, typeCache);
   }

Pls. provide [GitHub address] to reproduce this issue.

Expected Result

What do you expected from the above steps？

Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

Just put your stack trace here!

[horizonzy]

Hi, how can we reproduce it, could you provide a demo help to reproduce it, thanks.

[wilddragon]

https://github.com/wilddragon/dubbo-demo

[wilddragon]

this is a dubbo-demo, please put it to dubbo project directory.
then compile and run dubbo-demo-annotation-provider-2.7.8.jar, you will reproduce it.
https://github.com/wilddragon/dubbo-demo

[horizonzy]

We will see it later, thanks.

[xul0038]

1.创建自定义TypeBuilder

package com.xxx.dubbo.TreeBuilder;

public class TreeBuilder implements TypeBuilder , Prioritized {

    @Override
    public boolean accept(Type type, Class<?> clazz) {
        if (clazz == null) {
            return false;
        }
        return Tree.class.isAssignableFrom(clazz);
    }

    @Override
    public int getPriority() {
        return -1;
    }

    @Override
    public TypeDefinition build(Type type, Class<?> clazz, Map<Class<?>, TypeDefinition> typeCache) {
        // balabala...
    }
}

2. META-INF下创建dubbo/internal/org.apache.dubbo.metadata.definition.builder.TypeBuilder文件

tree=com.xxx.dubbo.TreeBuilder

#6306