Issue 1:
I have searched the issues of this repository and believe that this is not a duplicate.

I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

Dubbo version: 2.7.5

Operating System version: macOs Mojave 10.14.6

Java version: 1.8

Steps to reproduce this issue

正常启动项目后无法使用telnet的ls,cd,invoke等命令；

自己通过debug发现，在读取/META-INF/dubbo/internal/org.apache.dubbo.remoting.telnet.TelnetHandler这个配置文件的时候，在解析第6到14这几行的时候，出现了类加载失败的情况。

于是我便去源码中找了这几个类，发现它们的包结构和之前的版本2.7.4.1有所不同。

这几个类由org.apache.dubbo.rpc.protocol.dubbo.telnet包移动到了org.apache.dubbo.qos.legacy这个包下面。

我不知道我有没有找到根本原因，但这一定是其中之一，目前也有一个解决办法，并且我已经使用这个方法解决了这个问题。我把这些加载失败的Telnet类，放到了Telnet扩展中。

解决方案

把临时解决方案贴上来，希望能帮助遇到同样问题的小伙伴。

在项目resources目录中添加META-INF/dubbo/org.apache.dubbo.remoting.telnet.TelnetHandler文本文件，然后将加载失败的类包名修改后，配置到文件中。

文件内容如下：

ls=org.apache.dubbo.qos.legacy.ListTelnetHandler
ps=org.apache.dubbo.qos.legacy.PortTelnetHandler
cd=org.apache.dubbo.qos.legacy.ChangeTelnetHandler
pwd=org.apache.dubbo.qos.legacy.CurrentTelnetHandler
invoke=org.apache.dubbo.qos.legacy.InvokeTelnetHandler
trace=org.apache.dubbo.qos.legacy.TraceTelnetHandler
count=org.apache.dubbo.qos.legacy.CountTelnetHandler
select=org.apache.dubbo.qos.legacy.SelectTelnetHandler
shutdown=org.apache.dubbo.qos.legacy.ShutdownTelnetHandler
clear=org.apache.dubbo.remoting.telnet.support.command.ClearTelnetHandler
exit=org.apache.dubbo.remoting.telnet.support.command.ExitTelnetHandler
help=org.apache.dubbo.remoting.telnet.support.command.HelpTelnetHandler
status=org.apache.dubbo.remoting.telnet.support.command.StatusTelnetHandler
log=org.apache.dubbo.remoting.telnet.support.command.LogTelnetHandler

在项目中添加配置项：

dubbo.protocol.telnet=clear,exit,help,status,log,ls,ps,cd,pwd,invoke,trace,count,select,shutdown

使用方法在官方文档中有说明：扩展telnet

这个问题修改/META-INF/dubbo/internal/org.apache.dubbo.remoting.telnet.TelnetHandler的文件内容后就会解决，如有使用不当之处，还望开发者回复。

Pls. provide [GitHub address] to reproduce this issue.

Expected Result

What do you expected from the above steps？

Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

Unsupported command: ls

Issue 2:
I have searched the issues of this repository and believe that this is not a duplicate.

I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

Dubbo version: xxx

Operating System version: linux centos 7

Java version: 1.8

Steps to reproduce this issue

[INFO] --------------------------------[ jar ]---------------------------------

Downloading from alibaba-opensource-releases: http://code.alibabatech.com/mvn/releases/com/alibaba/platform/shared/dubbo.rpc/maven-metadata.xml

^@[WARNING] Could not transfer metadata com.alibaba.platform.shared:dubbo.rpc/maven-metadata.xml from/to alibaba-opensource-releases (http://code.alibabatech.com/mvn/releases): Transfer failed for http://code.alibabatech.com/mvn/releases/com/alibaba/platform/shared/dubbo.rpc/maven-metadata.xml

Downloading from alibaba-opensource-releases: http://code.alibabatech.com/mvn/releases/com/alibaba/platform/shared/dubbo.remoting/maven-metadata.xml

^@^@[WARNING] Could not transfer metadata com.alibaba.platform.shared:dubbo.remoting/maven-metadata.xml from/to alibaba-opensource-releases (http://code.alibabatech.com/mvn/releases): Transfer failed for http://code.alibabatech.com/mvn/releases/com/alibaba/platform/shared/dubbo.remoting/maven-metadata.xml

Downloading from alibaba-opensource-releases: http://code.alibabatech.com/mvn/releases/com/alibaba/platform/shared/dubbo/maven-metadata.xml

^@^@[WARNING] Could not transfer metadata com.alibaba.platform.shared:dubbo/maven-metadata.xml from/to alibaba-opensource-releases (http://code.alibabatech.com/mvn/releases): Transfer failed for http://code.alibabatech.com/mvn/releases/com/alibaba/platform/shared/dubbo/maven-metadata.xml

Expected Result

What do you expected from the above steps？

Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

Just put your stack trace here!