求大神解救 网站总是突然就访问不了了

WebSphere Platform 6.1 [ND 6.1.0.7 cf70711.17]  running with process name cwnetNode01CellcwnetNode01server1 and process id 385228
Host Operating System is AIX, version 5.3
Java version = J2RE 1.5.0 IBM J9 2.3 AIX ppc-32 j9vmap3223-20060504 (JIT enabled)
J9VM - 20060501_06428_bHdSMR
JIT  - 20060428_1800_r8
GC   - 20060501_AA, Java Compiler = j9jit23, Java VM name = IBM J9 VM
was.install.root = /webapp/WebSphere
user.install.root = /webapp/WebSphere/profiles/AppSrv01
Java Home = /webapp/WebSphere/java/jre

数据库oracle9

我现在只能靠频繁reboot来让网站恢复运行，恢复只有过不了多久，就有挂掉了。
停止服务停止不了
杀掉进程后，启动服务可以成功。但是仍然访问不了网站，连页面都不出，报错找不到服务器。基本排除数据库问题，以往数据库问题网站静态页面会出现的。

小弟真的不知道什么毛病了
求求各位大神帮帮忙啊
小弟先跪谢了！！！！
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systemerr.log部分错误日志

at com.ibm.ws.webcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:412)
[7/8/14 15:36:09:945 CDT] 0000002e SystemErr     R
at com.ibm.ws.wswebcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:113)
[7/8/14 15:36:09:945 CDT] 0000002e SystemErr     R
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3184)
[7/8/14 15:36:09:945 CDT] 0000002e SystemErr     R
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:254)
[7/8/14 15:36:09:945 CDT] 0000002e SystemErr     R
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:811)
[7/8/14 15:36:09:945 CDT] 0000002e SystemErr     R
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1433)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:111)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:454)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:383)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:263)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.io.async.AsyncChannelFuture$1.run(AsyncChannelFuture.java:205)
[7/8/14 15:36:09:946 CDT] 0000002e SystemErr     R
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1469)
[7/8/14 15:36:11:356 CDT] 0000001b SystemErr     R java.io.FileNotFoundException: /undefined
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.webcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:412)
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.wswebcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:113)
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3184)
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:254)
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:811)
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1433)
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:111)
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:454)
[7/8/14 15:36:11:366 CDT] 0000001b SystemErr     R
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:383)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:263)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:195)
[7/8/14 15:36:11:367 CDT] 0000001b SystemErr     R
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:743)
[7/8/14 15:36:11:368 CDT] 0000001b SystemErr     R
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:873)
[7/8/14 15:36:11:368 CDT] 0000001b SystemErr     R
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1469)
[7/8/14 15:36:13:359 CDT] 0000001f SystemErr     R java.io.FileNotFoundException: /imaFges/index1_14.gif
[7/8/14 15:36:13:370 CDT] 0000001f SystemErr     R
at com.ibm.ws.webcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:412)