I have a couple of seam apps that we're trying to migrate from tomcat deployments to jboss deployments. WAR makes the most sense in my opinion still, since the main thing we're using is hibernate's caching. In general, everything works ok, but I see this in the logs. 2009-07-16 10:22:27,853 WARN [org.jboss.web.tomcat.service.session.distributedcache.impl.jbc.CacheListener] (Incoming-13,172.17.11.16:33287) Possible concurrency problem: Replicated version id 100 is less than or equal to in-memory version for session KU99koDyou45fJcau9qcHA__ And every once in a while I'll get the generic error in seam/jsf about something went wrong. The stack traces look typically like: 2009-07-16 10:00:26,538 WARN [org.jboss.web.tomcat.service.session.distributedcache.impl.jbc.CacheListener] (Incoming-11,172.17.11.16:33287) Possible concurrency problem: Replicated version id 3 is less than or equal to in-memory version for session KU99koDyou45fJcau9qcHA__ 2009-07-16 10:00:28,073 ERROR [facelets.viewhandler] (http-172.17.11.16-8380-7) Error Rendering View[/viewShipment.xhtml] com.sun.facelets.tag.TagAttributeException: /viewShipment.xhtml @28,238 timeZone="#{storeBean.currentStore.timeZone}" /viewShipment.xhtml @28,238 timeZone="#{storeBean.currentStore.timeZone}": Error reading 'currentStore' on type com.coat.web.wm.intransit.reports.CurrentStoreBean_$$_javassist_1 at com.sun.facelets.tag.TagAttribute.getObject(TagAttribute.java:235) at com.sun.facelets.tag.TagAttribute.getObject(TagAttribute.java:166) at com.sun.facelets.tag.jsf.core.ConvertDateTimeHandler.setAttributes(ConvertDateTimeHandler.java:107) at com.sun.facelets.tag.jsf.ConvertHandler.apply(ConvertHandler.java:116) at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314) at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169) at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314) at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169) at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314) at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169) at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) at com.sun.facelets.tag.ui.DefineHandler.applyDefinition(DefineHandler.java:64) at com.sun.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:131) at com.sun.facelets.impl.DefaultFaceletContext$TemplateManager.apply(DefaultFaceletContext.java:337) at com.sun.facelets.impl.DefaultFaceletContext.includeDefinition(DefaultFaceletContext.java:307) at com.sun.facelets.tag.ui.InsertHandler.apply(InsertHandler.java:68) at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) at com.sun.facelets.tag.jsf.core.ViewHandler.apply(ViewHandler.java:109) at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49) at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25) at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:248) at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:294) at com.sun.facelets.impl.DefaultFacelet.include(DefaultFacelet.java:273) at com.sun.facelets.impl.DefaultFaceletContext.includeFacelet(DefaultFaceletContext.java:140) at com.sun.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:113) at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49) at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25) at com.sun.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:95) at com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:524) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:567) at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100) at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:638) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:444) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:382) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:310) at org.jboss.seam.web.RewriteFilter.process(RewriteFilter.java:98) at org.jboss.seam.web.RewriteFilter.doFilter(RewriteFilter.java:57) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) Any ideas? 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