tomcat启动问题

SEVERE: Error starting endpoint
Address already in use:8080
        at org.apache.tomcat.(PoolTcpEndpoint.java:298)
        at org.apache.tomcat.(PoolTcpEndpoint.java:313)
        at org.apache.coyote.http11.Http11BaseProtocol.start(Http11BaseProtocol.java:151)
        at org.apache.coyote.http11.Http11Protocol.start(Http11Protocol.java:76)
        at org.apache.catalina.connector.Connector.start(Connector.java:1075)
        at org.apache.catalina.core.StandardService.start(StandardService.java:457)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Jun 21, 2010 4:24:32 PM org.apache.catalina.startup.Catalina start
SEVERE: Catalina.start:
LifecycleException:  service.getName(): "Catalina";  Protocol handler start failed: Address already in use:8080
        at org.apache.catalina.connector.Connector.start(Connector.java:1082)
        at org.apache.catalina.core.StandardService.start(StandardService.java:457)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Jun 21, 2010 4:24:32 PM org.apache.catalina.startup.Catalina start
这个是哪里配置的问题？我重启tomcat有时候就出现，有时候就没事，有没有人能帮忙解释下