Hi,
I'm using Seam 2 CR1 and Glassfish V2.

When I call a page with params:

<page view-id="/registration/activate.xhtml" >
 <param name="email" value="#{email}" />
 <param name="activationcode" value="#{activationcode}" />
 <action execute="#{ejb_registrationcompletion.activateAccount}"/>
 </page>

[#|2007-09-29T16:43:14.684+0200|INFO|sun-appserver9.1|javax.enterprise.system.stream.out|_ThreadID=18;_ThreadName=httpSSLWorkerThread-8080-0;|2007-09-29 16:43:14,679 [httpSSLWorkerThread-8080-0] ERROR org.jboss.seam.jsf.SeamPhaseListener afterPhase - uncaught exception
java.lang.NullPointerException
 at org.jboss.seam.navigation.Param.validateConvertedValue(Param.java:246)
 at org.jboss.seam.navigation.Pages.convertAndValidateStringValuesInPageContext(Pages.java:745)
 at org.jboss.seam.navigation.Pages.postRestore(Pages.java:395)
 at org.jboss.seam.jsf.SeamPhaseListener.postRestorePage(SeamPhaseListener.java:528)
 at org.jboss.seam.jsf.SeamPhaseListener.afterRestoreView(SeamPhaseListener.java:374)
 at org.jboss.seam.jsf.SeamPhaseListener.afterServletPhase(SeamPhaseListener.java:211)
 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.servletService(ApplicationFilterChain.java:411)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:317)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
 at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
 at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
 at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
 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:44)
 at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
 at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141)
 at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281)
 at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
 at org.jboss.seam.servlet.SeamFilter$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:150)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:288)
 at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
 at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:206)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:150)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
 at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
 at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:270)
 at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:637)
 at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
 at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:813)
 at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:339)
 at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:261)
 at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:212)
 at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
 at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)