We've got the same problem with our seam 1.1 project running on JBoss 4.0.5 (current jems 1.2 installer).
We get the following error: javax.faces.el.EvaluationException: /view/manage/user_search.xhtml @118,174 value="#{messages[selectedObject.title]} #{selectObject.academicTitle}": Cannot get value for expression '#{org.jboss.seam.core.messages}' at com.sun.facelets.el.LegacyValueBinding.getValue(LegacyValueBinding.java:60) at javax.faces.component.UICommand.getValue(UICommand.java:170) at org.apache.myfaces.shared_impl.renderkit.html.HtmlLinkRendererBase.encodeBegin(HtmlLinkRendererBase.java:93) at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:512) at org.apache.myfaces.shared_impl.renderkit.RendererUtils.renderChild(RendererUtils.java:433) at org.apache.myfaces.shared_impl.renderkit.RendererUtils.renderChildren(RendererUtils.java:419) at org.apache.myfaces.shared_impl.renderkit.RendererUtils.renderChild(RendererUtils.java:440) at org.apache.myfaces.shared_impl.renderkit.html.HtmlTableRendererBase.renderColumnBody(HtmlTableRendererBase.java:332) at org.apache.myfaces.shared_impl.renderkit.html.HtmlTableRendererBase.encodeColumnChild(HtmlTableRendererBase.java:301) at org.apache.myfaces.shared_impl.renderkit.html.HtmlTableRendererBase.encodeInnerHtml(HtmlTableRendererBase.java:277) at org.apache.myfaces.shared_impl.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlTableRendererBase.java:123) at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:524) at com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:234) at com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:239) at com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:239) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:580) at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:101) at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:222) at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:384) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:138) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.seam.servlet.SeamExceptionFilter.doFilter(SeamExceptionFilter.java:46) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:32) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:75) at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:213) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:697) at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:889) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) Caused by: java.lang.NullPointerException at org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoader.java:620) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:464) at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:405) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at org.jboss.seam.jsf.SeamApplication11.getPropertyResolver(SeamApplication11.java:168) at org.apache.myfaces.el.ELParserHelper$MyPropertySuffix.evaluate(ELParserHelper.java:532) at org.apache.commons.el.ComplexValue.evaluate(ComplexValue.java:145) at org.apache.myfaces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:383) at org.jboss.seam.core.Expressions$1.getValue(Expressions.java:51) at org.jboss.seam.Component.getInstanceFromFactory(Component.java:1666) at org.jboss.seam.Component.getInstance(Component.java:1615) at org.jboss.seam.Component.getInstance(Component.java:1592) at org.jboss.seam.jsf.SeamVariableResolver.resolveVariable(SeamVariableResolver.java:46) at org.apache.myfaces.config.LastVariableResolverInChain.resolveVariable(LastVariableResolverInChain.java:42) at com.sun.facelets.el.LegacyELContext$LegacyELResolver.getValue(LegacyELContext.java:134) at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:65) at com.sun.el.parser.AstValue.getValue(AstValue.java:106) at com.sun.el.parser.AstDeferredExpression.getValue(AstDeferredExpression.java:46) at com.sun.el.parser.AstCompositeExpression.getValue(AstCompositeExpression.java:51) at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:192) at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71) at com.sun.facelets.el.LegacyValueBinding.getValue(LegacyValueBinding.java:56) ... 54 more The messages are injected using the following code: @In(create = true) protected Map<String, String> messages; The error only occurs occasionally and can be reproduced by fast clicking through the pages for some time. 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