- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of
this repository and believe that this is not a duplicate.
- [ ] I have checked the
[FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository
and believe that this is not a duplicate.
### Environment
* Dubbo version: 2.7.3
* Operating System version: linux
* Java version: 1.8
### Steps to reproduce this issue
1. MapTypeBuilder 中写死map泛型参数数目必须为2，导致在使用外部开源的原生类型的map判断报错。
```java
@Override
public TypeDefinition build(Type type, Class<?> clazz, Map<Class<?>,
TypeDefinition> typeCache) {
if (!(type instanceof ParameterizedType)) {
return new TypeDefinition(clazz.getName());
}
ParameterizedType parameterizedType = (ParameterizedType) type;
Type[] actualTypeArgs = parameterizedType.getActualTypeArguments();
if (actualTypeArgs == null || actualTypeArgs.length != 2) {
throw new IllegalArgumentException(MessageFormat.format(
"[ServiceDefinitionBuilder] Map type [{0}] with unexpected amount of
arguments [{1}]." + actualTypeArgs,
new Object[] {type, actualTypeArgs}));
}
for (Type actualType : actualTypeArgs) {
if (actualType instanceof ParameterizedType) {
// Nested collection or map.
Class<?> rawType = (Class<?>) ((ParameterizedType)
actualType).getRawType();
TypeDefinitionBuilder.build(actualType, rawType, typeCache);
} else if (actualType instanceof Class<?>) {
Class<?> actualClass = (Class<?>) actualType;
if (actualClass.isArray() || actualClass.isEnum()) {
TypeDefinitionBuilder.build(null, actualClass, typeCache);
} else {
DefaultTypeBuilder.build(actualClass, typeCache);
}
}
}
```
如下所示，参数长度为1。
```java
package it.unimi.dsi.fastutil.ints;
public interface Int2ObjectMap<V> extends Int2ObjectFunction<V>, Map<Integer,
V> {}
```
该类来自于
<dependency>
<groupId>it.unimi.dsi</groupId>
<artifactId>fastutil</artifactId>
</dependency>
### Expected Result
是否可以去除该判断。
[ Full content available at: https://github.com/apache/dubbo/issues/5122 ]
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