Debugging page expired exception errors

["Brown, Berlin [GCG-PFS]" <Be...@Primerica.com>]

I get two pageexpiredexception errors and I can't recreate the problem.
With an error like this, what would cause this type of page expired
exception error? 
 
Do you think that the page actually expired?  Or is there something
wrong with writing or reading from the page map file on disk.
 
 
ERROR ONE:
 
2011-05-06 23:21:43,619 ERROR -
Cannot find the rendered page in session
[pagemap=null,componentPath=2:contentPanelContainer:contentPanel:panel:f
ield,versionNumber=0]
org.apache.wicket.protocol.http.PageExpiredException: Cannot find the
rendered page in session
[pagemap=null,componentPath=2:contentPanelContainer:contentPanel:panel:f
ield,versionNumber=0]
 at
org.apache.wicket.protocol.http.WebRequestCycleProcessor.resolve(WebRequ
estCycleProcessor.java:197)
 at org.apache.wicket.RequestCycle.step(RequestCycle.java:1310)
 at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1436)
 at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
 at
org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:484
)
 at
org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:
160)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
 at
com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.ja
va:1146)
 at
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrap
per.java:592)
 at
com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWr
apper.java:525)
 at
com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3548)
 at
com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:269)
 at
com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:831
)
 at
com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1
478)
 at
com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:1
33)
 at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscriminatio
n(HttpInboundLink.java:458)
 at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformatio
n(HttpInboundLink.java:387)
 at
com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpIC
LReadCallback.java:102)
 at
com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallba
ck.complete(SSLReadServiceContext.java:1818)
 at
com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(Ai
oReadCompletionListener.java:165)
 at
com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.
java:217)
 at
com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFu
ture.java:161)
 at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
 at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:196)
 at
com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java
:751)
 at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:881)
 at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)
....

ERROR TWO:
 
Request cannot be processed
org.apache.wicket.protocol.http.PageExpiredException: Request cannot be
processed
 at
org.apache.wicket.protocol.http.WebRequestCycleProcessor.resolve(WebRequ
estCycleProcessor.java:163)
 at org.apache.wicket.RequestCycle.step(RequestCycle.java:1310)
 at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1436)
 at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
 at
org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:484
)
 at
org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:
160)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
 at
com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.ja
va:1146)
 at
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrap
per.java:592)
 at
com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWr
apper.java:525)
 at
com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3548)
 at
com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:269)
 at
com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:831
)
 at
com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1
478)
 at
com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:1
33)
 at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscriminatio
n(HttpInboundLink.java:458)
 at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformatio
n(HttpInboundLink.java:387)
 at
com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpIC
LReadCallback.java:102)
 at
com.ibm.ws.ssl.channel.impl.SSLReadServiceContext$SSLReadCompletedCallba
ck.complete(SSLReadServiceContext.java:1818)
 at
com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(Ai
oReadCompletionListener.java:165)
 at
com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.
java:217)
 at
com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFu
ture.java:161)
 at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
 at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:196)
 at
com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java
:751)
 at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:881)
 at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)