tomcat 运行一段时间自动关闭原因
1，并发用户数目过大，也会导致tomcat自动停止服务。? (95%)
2，系统本身的网络负载平衡没有做好，导致tomcat自动停止服务；??
3，程序迭代不合理也是一个原因；??
4，数据库连接未关闭，导致资源损耗过重，会引起服务停止；??
5，程序严重错误，也会引起tomcat停止服务！
?
求解决方法！！！！
信息: Server startup in 84081 ms2011-6-29 17:30:30 org.apache.coyote.http11.Http11Protocol pause信息: Pausing Coyote HTTP/1.1 on http-80882011-6-29 17:30:30 org.apache.catalina.connector.Connector pause严重: Protocol handler pause failedjava.net.SocketException: Network is unreachableat java.net.PlainSocketImpl.socketConnect(Native Method)at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)at java.net.Socket.connect(Socket.java:529)at java.net.Socket.connect(Socket.java:478)at java.net.Socket.<init>(Socket.java:375)at java.net.Socket.<init>(Socket.java:218)at org.apache.jk.common.ChannelSocket.unLockSocket(ChannelSocket.java:492)at org.apache.jk.common.ChannelSocket.pause(ChannelSocket.java:288)at org.apache.jk.server.JkMain.pause(JkMain.java:726)at org.apache.jk.server.JkCoyoteHandler.pause(JkCoyoteHandler.java:153)at org.apache.catalina.connector.Connector.pause(Connector.java:1037)at org.apache.catalina.core.StandardService.stop(StandardService.java:578)at org.apache.catalina.core.StandardServer.stop(StandardServer.java:788)at org.apache.catalina.startup.Catalina.stop(Catalina.java:662)at org.apache.catalina.startup.Catalina$CatalinaShutdownHook.run(Catalina.java:706)2011-6-29 17:30:31 org.apache.catalina.core.StandardService stop信息: Stopping service Catalina2011-6-29 17:30:31 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc严重: The web application [/HWT] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.2011-6-29 17:30:31 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads严重: The web application [/HWT] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.2011-6-29 17:30:32 org.apache.coyote.http11.Http11Protocol destroy信息: Stopping Coyote HTTP/1.1 on http-8088