- [x] I have searched the 
[issues](https://github.com/apache/incubator-dubbo/issues) of this repository 
and believe that this is not a duplicate.
- [x] I have checked the 
[FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this 
repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.0+
* Operating System version: mac
* Java version: 1.8

### Steps to reproduce this issue

Assume that there is an interface below:

```
package com.youzan.nova.service;

import java.util.Set;

public interface OverrideService {

    void invoke(Integer id, Set<String> orderNumbers);

    void invoke(Long id, Set<String> orderNumbers);

}

package com.youzan.nova.service;

import java.util.Set;

public class OverrideServiceImpl implements OverrideService {
    @Override
    public void invoke(Integer id, Set<String> orderNumbers) {
        System.out.println(id);
    }

    @Override
    public void invoke(Long id, Set<String> orderNumbers) {
        System.out.println(id);
    }
}

```

Start telnet call service:

```
invoke com.youzan.nova.service.OverrideService.invoke("13", Set["1"])
invoke com.youzan.nova.service.OverrideService.invoke("13L", Set["1"])
```

Always only call the method `invoke(Long id, Set<String> orderNumbers)`.

[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/2766 ]
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