We have the external search engine crawling the WPS 6.1 portal .. When the search engine is continuously crawling the portal server portal server is giving Thread Hung issue so can you please let me know how to resolve the same

Also we are getting one error in the log file not sure why theme is causing illegalstateException so can you please help to resolve the same ... Looking forward for your help

themes/html/ep_theme/Default.jsp. Exception thrown : java.lang.IllegalStateException:
Session Object Internals:
id : PBWZIw6YgDmmCjIuAGaG7_9
hashCode : 2046700498
create time : Tue Nov 11 00:34:44 EST 2008
last access : Tue Nov 11 00:34:44 EST 2008
max inactive interval : 0
user name : anonymous
valid session : false
new session : true
overflowed : false
app name : default_host/wps
non-serializable app specific session data : null
serializable app specific session data : []

at com.ibm.ws.webcontainer.httpsession.SessionData.ge tValueGuts(SessionData.java:839)
at com.ibm.ws.webcontainer.httpsession.SessionData.ge tValue(SessionData.java:1243)
at com.ibm.ws.webcontainer.httpsession.SessionData.ge tAttribute(SessionData.java:1129)
at com.ibm.ws.webcontainer.httpsession.HttpSessionFac ade.getAttribute(HttpSessionFacade.java:120)
at org.apache.jasper.runtime.PageContextImpl.findAttr ibute(PageContextImpl.java:392)
at com.ibm._jsp._Default._jspService(_Default.java:21 87)
at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJsp Base.java:87)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.ser vice(ServletWrapper.java:1068)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.ser vice(ServletWrapper.java:1009)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.d oFilter(WebAppFilterChain.java:118)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._ doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager .doFilter(WebAppFilterManager.java:771)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager .doFilter(WebAppFilterManager.java:679)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.han dleRequest(ServletWrapper.java:539)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.h andleRequest(ServletWrapper.java:478)
at com.ibm.wsspi.webcontainer.servlet.GenericServletW rapper.handleRequest(GenericServletWrapper.java:12 2)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensio nServletWrapper.handleRequest(AbstractJSPExtension ServletWrapper.java:225)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispat cher.include(WebAppRequestDispatcher.java:639)
at com.ibm.wps.services.dispatcher.DispatcherServiceI mpl.handleRequest(DispatcherServiceImpl.java:93)
at com.ibm.wps.services.dispatcher.DispatcherServiceI mpl.include(DispatcherServiceImpl.java:53)
at com.ibm.wps.services.dispatcher.Dispatcher.include (Dispatcher.java:50)
at com.ibm.wps.engine.templates.themes.Default.doDisp atch(Default.java:283)
at com.ibm.wps.engine.templates.themes.Default.render (Default.java:236)
at com.ibm.wps.engine.templates.ThemeTemplate.render( ThemeTemplate.java:65)
at com.ibm.wps.engine.phases.WPRenderPhase.processRen dering(WPRenderPhase.java:394)
at com.ibm.wps.engine.phases.WPBaseRenderPhase.execut e(WPBaseRenderPhase.java:173)
at com.ibm.wps.state.phases.AbstractRenderPhase.next( AbstractRenderPhase.java:106)
at com.ibm.wps.engine.phases.WPAbstractRenderPhase.ne xt(WPAbstractRenderPhase.java:97)
at com.ibm.wps.engine.Servlet.callPortal(Servlet.java :805)
at com.ibm.wps.engine.Servlet.doGet(Servlet.java:607)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:743)
at com.ibm.wps.engine.Servlet.doFilter(Servlet.java:1 184)
at com.ibm.wps.resolver.servlet.ContentHandlerCleanup .doFilter(ContentHandlerCleanup.java:648)
at com.ibm.wps.resolver.servlet.AbstractFilter.doFilt er(AbstractFilter.java:82)
at com.ibm.wps.engine.Servlet.service(Servlet.java:11 75)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.ser vice(ServletWrapper.java:1068)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.ser vice(ServletWrapper.java:1009)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.d oFilter(WebAppFilterChain.java:145)
at com.ibm.wps.engine.ExtendedLocaleFilter.doFilter(E xtendedLocaleFilter.java:99)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapp er.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.d oFilter(WebAppFilterChain.java:130)
at com.ibm.wps.state.filter.StateCleanup.doFilter(Sta teCleanup.java:89)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapp er.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.d oFilter(WebAppFilterChain.java:130)
at com.ibm.wps.resolver.friendly.servlet.FriendlySele ctionFilter.doFilter(FriendlySelectionFilter.java: 189)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapp er.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.d oFilter(WebAppFilterChain.java:130)
at com.ibm.wps.engine.VirtualPortalFilter.doFilter(Vi rtualPortalFilter.java:88)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapp er.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.d oFilter(WebAppFilterChain.java:130)
at com.ibm.wps.mappingurl.impl.URLAnalyzer.doFilter(U RLAnalyzer.java:282)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapp er.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.d oFilter(WebAppFilterChain.java:130)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._ doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager .doFilter(WebAppFilterManager.java:771)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager .doFilter(WebAppFilterManager.java:679)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.han dleRequest(ServletWrapper.java:539)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.h andleRequest(ServletWrapper.java:478)
at com.ibm.ws.webcontainer.webapp.WebApp.handleReques t(WebApp.java:3365)
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequ est(WebGroup.java:267)
at com.ibm.ws.webcontainer.WebContainer.handleRequest (WebContainer.java:814)
at com.ibm.ws.wswebcontainer.WebContainer.handleReque st(WebContainer.java:1455)
at com.ibm.ws.webcontainer.channel.WCChannelLink.read y(WCChannelLink.java:115)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLi nk.handleDiscrimination(HttpInboundLink.java:454)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLi nk.handleNewInformation(HttpInboundLink.java:383)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLi nk.ready(HttpInboundLink.java:263)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialRe adCallback.sendToDiscriminators(NewConnectionIniti alReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialRe adCallback.complete(NewConnectionInitialReadCallba ck.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListe ner.futureCompleted(AioReadCompletionListener.java :165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallbac k(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletion Actions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture .java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHand ler.java:195)
at com.ibm.io.async.ResultHandler.runEventProcessingL oop(ResultHandler.java:743)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler .java:873)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.j ava:1473)