When an EL expression is not closed by a brace, an error is thrown. It would be better to show the wrong expression as it is: 1/ it's already the way of doing the thing, see in InterpolatorTest the existing case of // test that a messageformat error doesn't blow up Assert.assertEquals("{nosuchmessage}", interpolator.interpolate("{nosuchmessage}")); 2/ atm when an EL expression is not closed by a brace, the trace doesn't give a clear clue of what is wrong (see trace below). I wasted too much time with such an error. With the wrong expression shown in place of the expected result, it'd be straightforward. In any case I suggest to check that the end bracket is present and at least to throw a exception with a specific message. ==================== Error in Authenticator: | public boolean authenticate() { | try { | User user = (User) entityManager | .createQuery( | "from User where username = :username and password = :password") | .setParameter("username", identity.getUsername()) | .setParameter("password", identity.getPassword()) | .getSingleResult(); | | if (user.getRoles() != null) { | for (UserRole mr : user.getRoles()) | Identity.instance().addRole(mr.getName()); | } | return true; | } catch (NoResultException ex) { | FacesMessages.instance().add( | "#{messages['entity.user.login.invalid']"); | return false; | } | } | | and the trace (only the first occurence, as it starts a loop): anonymous wrote : | 13:47:43,500 INFO [STDOUT] Hibernate: select user0_.username as username11_, user0_.name as name11_, user0_.password as password11_, user0_.currentBranch as currentB4_11_ from User user0_ where user0_.username=? and user0_.password=? | 13:47:43,531 ERROR [SeamPhaseListener] uncaught exception | java.util.NoSuchElementException | at java.util.StringTokenizer.nextToken(StringTokenizer.java:332) | at org.jboss.seam.core.Interpolator.interpolateExpressions(Interpolator.java:94) | at org.jboss.seam.core.Interpolator.interpolate(Interpolator.java:66) | at org.jboss.seam.faces.FacesMessages.createFacesMessage(FacesMessages.java:371) | at org.jboss.seam.faces.FacesMessages.createFacesMessage(FacesMessages.java:379) | at org.jboss.seam.faces.FacesMessages$1.run(FacesMessages.java:425) | at org.jboss.seam.faces.FacesMessages.runTasks(FacesMessages.java:156) | at org.jboss.seam.faces.FacesMessages.afterPhase(FacesMessages.java:166) | at org.jboss.seam.jsf.SeamPhaseListener.afterServletPhase(SeamPhaseListener.java:224) | at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:184) | at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:280) | at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:82) | at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:68) | at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:68) | at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:68) | at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:44) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:68) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:127) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:277) | at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:68) | at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:68) | at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:149) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) | at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) | at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) | at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:624) | at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445) | at java.lang.Thread.run(Thread.java:595) | 13:47:43,562 ERROR [CachedConnectionValve] Application error: Faces Servlet did not complete its transaction | 13:47:43,609 ERROR [SeamPhaseListener] uncaught exception | java.util.NoSuchElementException | at java.util.StringTokenizer.nextToken(StringTokenizer.java:332) | at org.jboss.seam.core.Interpolator.interpolateExpressions(Interpolator.java:94) | at org.jboss.seam.core.Interpolator.interpolate(Interpolator.java:66) | at org.jboss.seam.faces.FacesMessages.createFacesMessage(FacesMessages.java:371) | at org.jboss.seam.faces.FacesMessages.createFacesMessage(FacesMessages.java:379) | at org.jboss.seam.faces.FacesMessages$1.run(FacesMessages.java:425) | | [...] | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4078720#... 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