### Environment
* Dubbo version: 2.7.*
* Operating System version: xxx
* Java version: 8
* springboot: 2.2.4
### Steps to reproduce this issue
1. I want to use dubbo with springboot
2. Need two protocol - rest and dubbo
3. Rest server is tomcat, and I use tomcat9 in my project
### Exception
```
An attempt was made to call a method that does not exist. The attempt was made
from the following location:
org.apache.dubbo.remoting.http.tomcat.TomcatHttpServer.<init>(TomcatHttpServer.java:66)
```
### What`s wrong
The code is
"tomcat.getConnector().setProtocol("org.apache.coyote.http11.Http11NioProtocol");"
[ Full content available at: https://github.com/apache/dubbo/issues/5711 ]
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