Hi,

(Seam 2.2.0, JBoss 4.2.3, jdk6)

I'm trying to set up a JBPM process (inspired from Seam in Action, chapter 14) :

1. some user changes the email of his account


2. an email is sent to the new specified address


3. the user opens a generated URL to confirm


4. the account is actually updated

@Name("changeUserEmail")
@Scope(ScopeType.EVENT)
public class ChangeUserEmailAction
{
    /** The request parameter of the confirmation code. */
    @RequestParameter("code")
    protected String confirmationCodeParam;

    /** Manages the UserAccount. */
    @In(create = true)
    private UserAccountHome userAccountHome;

    @BeginTask
    @EndTask(transition = "confirmed")
    public String confirm()
    {
        final UserAccount cueUserAccount = // from BPM context
        final String cueNewEmail = // from BPM context
        final String cueConfirmationCode = // from BPM context

        if (StringUtils.equals(confirmationCodeParam, cueConfirmationCode))
        {
            userAccountHome.setId(cueUserAccount.getId());
            userAccountHome.getInstance().getUser().setEmail(cueNewEmail);

            // *************************** 
            userAccountHome.update();
            // *************************** 

            confirmed = true;
            return "confirmed";
        }

        confirmed = false;
        return null;
    }
}

If I remove userAccountHome.update(), I don't have:

Exception during request processing: 
Caused by java.lang.NullPointerException with message: "Argument Error: Parameter message is null" 
com.sun.faces.util.Util.notNull(Util.java:241)
com.sun.faces.context.FacesContextImpl.addMessage(FacesContextImpl.java:322)
org.jboss.seam.faces.FacesMessages.beforeRenderResponse(FacesMessages.java:46)
org.jboss.seam.jsf.SeamPhaseListener.beforeRenderResponse(SeamPhaseListener.java:484)
org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:148)
org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:118)
com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:214)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:96)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
name.didier.david.seam.filter.SessionIdFilter.doFilter(SessionIdFilter.java:131)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
java.lang.Thread.run(Thread.java:619)

As far as I understand (which is not very far):
What I can see while debugging is that userAccountHome.update() is raising an event (raiseAfterTransactionSuccessEvent()) which ends the task, so BusinessProcess.resumeTask() is called a second times with the ID of the already ended task. Then BusinessProcess.taskEnded() is called and for some reason the message cannot be interpolated.

Maybe I'm doing things completely wrong, but I really cannot understand what's going on. Any help will be greatly appreciated...

David