在eclipse下运行tomcat后显示如下信息，是怎么回事？
2007-4-10 16:32:41 org.apache.coyote.http11.Http11Protocol init
严重: Error initializing endpoint
java.net.BindException: Address already in use: JVM_Bind:8081
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint
(PoolTcpEndpoint.java:297)
at org.apache.coyote.http11.Http11Protocol.init(Http11Protocol.java:142)
at org.apache.catalina.connector.Connector.initialize(Connector.java:928)
at org.apache.catalina.core.StandardService.initialize
(StandardService.java:580)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:764)
at org.apache.catalina.startup.Catalina.load(Catalina.java:490)
at org.apache.catalina.startup.Catalina.load(Catalina.java:509)
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.load(Bootstrap.java:243)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:408)
2007-4-10 16:32:42 org.apache.catalina.startup.Catalina load
严重: Catalina.start
LifecycleException: Protocol handler initialization failed: java.net.BindException:
Address already in use: JVM_Bind:8081
at org.apache.catalina.connector.Connector.initialize(Connector.java:930)
at org.apache.catalina.core.StandardService.initialize
(StandardService.java:580)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:764)
at org.apache.catalina.startup.Catalina.load(Catalina.java:490)
at org.apache.catalina.startup.Catalina.load(Catalina.java:509)
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.load(Bootstrap.java:243)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:408)
2007-4-10 16:32:42 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 1922 ms
2007-4-10 16:32:42 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2007-4-10 16:32:42 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/5.5.9
2007-4-10 16:32:42 org.apache.catalina.core.StandardHost start
信息: XML validation disabled
2007-4-10 16:32:44 org.apache.coyote.http11.Http11Protocol start
严重: Error starting endpoint
java.net.BindException: Address already in use: JVM_Bind:8081
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint
(PoolTcpEndpoint.java:297)
at org.apache.tomcat.util.net.PoolTcpEndpoint.startEndpoint
(PoolTcpEndpoint.java:312)
at org.apache.coyote.http11.Http11Protocol.start(Http11Protocol.java:182)