Port 8009 required by Tomcat v6.0 Server at localhost is already in use 问题

Port 8009 required by Tomcat v6.0 Server at localhost is already in use.The
server may already be running in another process, or a system process may be using the port. To start this server you will need to stop the other process or change
the port number(s).

此类问题解决办法：

1.检查端口是否真的被占用，如果确定没有，进行第二步操作

2. 打开任务管理器（ctrl + shift + esc / ctrl + alt + . ），关闭进程中javaw.exe

3. 如果2还是不行，就重启电脑，或者重新往eclipse中添加一个新的tomcat 。