### 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)


throw new RuntimeException(exceptionDescription, e);
                                }
                            } else if (field != null) {
                                value = realize0(value, field.getType(), field.getGenericType(), history);
                                try {
                                    field.set(dest, value);
                                } catch (IllegalAccessException e) {
                                    throw new RuntimeException("Failed to set field " + name + " of pojo " + dest.getClass().getName() + " : " + e.getMessage(), e);
                                }
                            }
                        }
                    }
                }
                if (dest instanceof Throwable) {
                    Object message = map.get("message");
                    if (message instanceof String) {
                        try {
                            Field field = Throwable.class.getDeclaredField("detailMessage");
                            if (!field.isAccessible()) {
                                field.setAccessible(true);
                            }
                            field.set(dest, message);
                        } catch (Exception e) {
                        }
                    }
                }
                return dest;
            }
        }
        return pojo;