Hi,

I have on production log4j appender that send mails on exceptions. I keep getting this exception:

17:45:33,850 ERROR [SeamPhaseListener] swallowing exception
javax.faces.validator.ValidatorException: Field must have value
       at org.jboss.seam.navigation.Param.addRequiredMessage(Param.java:268)
       at org.jboss.seam.navigation.Param.getStringValueFromRequest(Param.java:189)
       at org.jboss.seam.navigation.Pages.storeRequestStringValuesInPageContext(Pages.java:719)
       at org.jboss.seam.navigation.Pages.postRestore(Pages.java:371)
       at org.jboss.seam.jsf.SeamPhaseListener.postRestorePage(SeamPhaseListener.java:544)
       at org.jboss.seam.jsf.SeamPhaseListener.afterRestoreView(SeamPhaseListener.java:390)
       at org.jboss.seam.jsf.SeamPhaseListener.afterServletPhase(SeamPhaseListener.java:226)
       at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:192)
       at com.sun.faces.lifecycle.Phase.handleAfterPhase(Phase.java:175)
       at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:114)
       at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:104)
       at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
       at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
       at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:301)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
       at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
       at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
       at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:390)
       at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:517)
       at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
       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:233)
       at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
       at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
       at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
       at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
       at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
       at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
       at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
       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:690)
       at java.lang.Thread.run(Thread.java:619)

I don't see this exception on my local environment.
Does anyone has a clue?

Thanks,
Guy.