seam portlet error message
this is my register.xhtml
<f:view>
<h:form>
<s:validateAll>
<h:panelGrid columns="2">
</h:panelGrid>
</s:validateAll>
<h:messages/>
<h:commandButton value="Register" action="#{register.register}"/>
<s:link id="registered" view="/registered.xhtml" value="ddd" />
</h:form>
</f:view>
when I click ddd(s:link) , the application work
but click button action show the error message
javax.portlet.PortletException: Error process faces request
at javax.portlet.faces.GenericFacesPortlet.processAction(GenericFacesPortlet.java:168)
at org.jboss.portal.portlet.impl.jsr168.PortletContainerImpl.invokeAction(PortletContainerImpl.java:458)
at org.jboss.portal.portlet.impl.jsr168.PortletContainerImpl.dispatch(PortletContainerImpl.java:401)
at org.jboss.portal.portlet.container.PortletContainerInvoker$1.invoke(PortletContainerInvoker.java:86)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:131)
at org.jboss.portal.core.aspects.portlet.TransactionInterceptor.org$jboss$portal$core$aspects$portlet$TransactionInterceptor$invokeNotSupported$aop(TransactionInterceptor.java:86)
at org.jboss.portal.core.aspects.portlet.TransactionInterceptor$invokeNotSupported_N4547270787964792031.invokeNext(TransactionInterceptor$invokeNotSupported_N4547270787964792031.java)
at org.jboss.aspects.tx.TxPolicy.invokeInNoTx(TxPolicy.java:66)
at org.jboss.aspects.tx.TxInterceptor$NotSupported.invoke(TxInterceptor.java:112)
at org.jboss.portal.core.aspects.portlet.TransactionInterceptor$invokeNotSupported_N4547270787964792031.invokeNext(TransactionInterceptor$invokeNotSupported_N4547270787964792031.java)
at org.jboss.aspects.tx.TxPolicy.invokeInNoTx(TxPolicy.java:66)
at org.jboss.aspects.tx.TxInterceptor$NotSupported.invoke(TxInterceptor.java:102)
at org.jboss.portal.core.aspects.portlet.TransactionInterceptor$invokeNotSupported_N4547270787964792031.invokeNext(TransactionInterceptor$invokeNotSupported_N4547270787964792031.java)
at org.jboss.portal.core.aspects.portlet.TransactionInterceptor.invokeNotSupported(TransactionInterceptor.java)
at org.jboss.portal.core.aspects.portlet.TransactionInterceptor.invoke(TransactionInterceptor.java:56)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.core.aspects.portlet.HeaderInterceptor.invoke(HeaderInterceptor.java:50)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.portlet.aspects.portlet.ProducerCacheInterceptor.invoke(ProducerCacheInterceptor.java:53)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.core.aspects.portlet.AjaxInterceptor.invoke(AjaxInterceptor.java:51)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.portlet.aspects.portlet.ModesInterceptor.invoke(ModesInterceptor.java:62)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.portlet.bridge.BridgeInterceptor.invoke(BridgeInterceptor.java:47)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.portlet.aspects.portlet.WindowStatesInterceptor.invoke(WindowStatesInterceptor.java:55)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.portlet.aspects.portlet.PortletSessionSynchronizationInterceptor.invoke(PortletSessionSynchronizationInterceptor.java:80)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.portlet.aspects.portlet.ContextTrackerInterceptor.invoke(ContextTrackerInterceptor.java:46)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.portlet.aspects.portlet.ContextDispatcherInterceptor$1.doCallback(ContextDispatcherInterceptor.java:104)
at org.jboss.portal.web.command.CommandDispatcher$CallbackCommand.execute(CommandDispatcher.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.portal.web.command.CommandServlet.doGet(CommandServlet.java:131)
at org.jboss.portal.web.command.CommandServlet.doPost(CommandServlet.java:162)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
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:654)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
at org.jboss.portal.web.command.CommandServlet.include(CommandServlet.java:80)
at org.jboss.portal.web.command.CommandDispatcher.include(CommandDispatcher.java:50)
at org.jboss.portal.web.jboss.JBossWebContext.include(JBossWebContext.java:66)
at org.jboss.portal.web.ServletContainer.include(ServletContainer.java:182)
at org.jboss.portal.portlet.impl.spi.AbstractRequestContext.dispatch(AbstractRequestContext.java:81)
at org.jboss.portal.portlet.aspects.portlet.ContextDispatcherInterceptor.invoke(ContextDispatcherInterceptor.java:76)
at org.jboss.portal.portlet.invocation.PortletInterceptor.invoke(PortletInterceptor.java:38)
at org.jboss.portal.common.invocation.Invocation.invokeNext(Invocation.java:115)
at org.jboss.portal.portlet