### Environment

* Dubbo version: 2.7.4.1
* Operating System version: macOS Catalina Version 10.15.3
* Java version: 1.8.0_231

### Steps to reproduce this issue

1. 通过telnet调用接口如下
方法(Method)
`public String convert7(UserInfoCondition userInfoCondition) {  }`
参数(Parameter)
`public class UserInfoCondition {
    private List<Map<Integer, UserInfo>> userList;
}`
`public class UserInfo {
    private String accountMobile;
    private String userPassword;
}`

invoke UsesrInfoFacade.convert7({"userList":[{"1":{"accountMobile":"15052234567"}}]})
or
invoke UsesrInfoFacade.convert7({"userList":[{1:{"accountMobile":"15052234567"}}]})

提示如下错误(has a problem)
![image](https://user-images.githubusercontent.com/17045745/77892951-ebd50d00-72a5-11ea-95b0-dd59a68a83cc.png)

到底如何书写这个入参呢?(How to write the parameters)


}
        }
        if (pojo instanceof Collection<?>) {
            if (type.isArray()) {
                Class<?> ctype = type.getComponentType();
                Collection<Object> src = (Collection<Object>) pojo;
                int len = src.size();
                Object dest = Array.newInstance(ctype, len);
                history.put(pojo, dest);
                int i = 0;
                for (Object obj : src) {
                    Object value = realize0(obj, ctype, null, history);
                    Array.set(dest, i, value);
                    i++;
                }
                return dest;
            } else {
                Collection<Object> src = (Collection<Object>) pojo;
                int len = src.size();
                Collection<Object> dest = createCollection(type, len);
                history.put(pojo, dest);
                for (Object obj : src) {
                    Type keyType = getGenericClassByIndex(genericType, 0);
                    Class<?> keyClazz = obj == null ? null : obj.getClass();
                    if (keyType instanceof Class) {
                        keyClazz = (Class<?>) keyType;
                    }
                    Object value = realize0(obj, keyClazz, keyType, history);
                    dest.add(value);
                }