ubuntu gcc 求助啊

我建立了一个tomcat7 server，又建立了一个动态web project。按照网上提供的方法，右击“工程名”，选择run as --> Run On Server.可是出现如下错误：
Several ports (8005, 8080, 8009) required by Tomcat v7.0 Server at localhost are 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).
另外，选择Run On Server，对话框中显示Tomcat V7.0 at localhost 为 Stopped。这是怎么回事？