[jboss-user] [JBoss Seam] - "Stack must not be null" error when using ajax4jsf with seam

I'm using ajax4jsf inside seam 1.2.1 and I get an error : "javax.servlet.ServletException: Stack must not be null" when I click on a a4j checkbox button anonymous wrote : <h:selectBooleanCheckbox id="displayCheck" value="#{myManager.updateDisplay}"> | <a:support event="onchange" reRender="results" /> | </h:selectBooleanCheckbox> This happens only the first time I access the page (that basically displays a list that can be viewed two ways (according to the state of the boolean)) : if I reload the page I don't get the error anymore and everything is fine. With previous releases of seam, I had, at the exact same time, the "id must not be null" error and found out on ajax4jsf forums that this was due to a bug fixed in seam 1.2.1. But it seems to me there is still some kind of a problem ... Here is the complete stack trace : anonymous wrote : 16:52:44,071 ERROR [ExceptionFilter] uncaught exception | javax.servlet.ServletException: Stack must not be null | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:152) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63) | at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:60) | at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) | at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) | at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) | at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57) | at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) | at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79) | at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49) | at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) | at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) | at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) | at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) | at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) | at java.lang.Thread.run(Thread.java:595) | Any idea of what can be wrong ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4035053#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...