我正在尝试在我的 eclipse indigo 中运行 struts2 的 helloworld 教程。当我启动我的 tomcat 服务器时，我在控制台窗口中收到以下消息。突出显示的位是我无法理解的位。
Jun 13, 2012 1:12:28 PM org.apache.catalina.core.AprLifecycleListener init
**INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32;**
**Jun 13, 2012 1:12:28 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:StrutsExample1' did not find a matching property.**
Jun 13, 2012 1:12:28 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Jun 13, 2012 1:12:28 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Jun 13, 2012 1:12:28 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 735 ms
Jun 13, 2012 1:12:28 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Jun 13, 2012 1:12:28 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.27
Jun 13, 2012 1:12:31 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Jun 13, 2012 1:12:31 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Jun 13, 2012 1:12:31 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2586 ms
当我通过键入在浏览器上打开 tomcat 时http://localhost:8080，会显示错误消息HTTP Status 404 - /。我无法理解问题的根本原因。我使用windows7 64位。是因为我的系统和用户变量没有正确定义吗？