Accessing components by seam mail

[mgoetz]

Hello,

i've got a problem accessing a seam component in a mail template.

My setup:
JBoss 4.2.3.GA
Seam 2.0.2.SP1

Mails are sent via an asynchronous mail component with a template.
Component values are set via:
Contexts.getEventContext().set(training, training);

Accessing the components in the mail works fine, except an array i
want to display in the mail via h:dataTable. I'm able to display
the size of the array, but the displayed table is array and
i get a null pointer exception. I think the defined trainingParticipant
variable is not initalized.

The stacktrace:

15:44:16,900 ERROR [STDERR] java.lang.NullPointerException
15:44:16,903 ERROR [STDERR]     at com.sun.faces.el.ManagedBeanELResolver.getVal
ue(ManagedBeanELResolver.java:80)
15:44:16,906 ERROR [STDERR]     at javax.el.CompositeELResolver.getValue(Composi
teELResolver.java:53)
15:44:16,910 ERROR [STDERR]     at com.sun.faces.el.FacesCompositeELResolver.get
Value(FacesCompositeELResolver.java:72)
15:44:16,914 ERROR [STDERR]     at org.jboss.el.parser.AstIdentifier.getValue(As
tIdentifier.java:44)
15:44:16,917 ERROR [STDERR]     at org.jboss.el.parser.AstValue.getValue(AstValu
e.java:63)
15:44:16,920 ERROR [STDERR]     at org.jboss.el.ValueExpressionImpl.getValue(Val
ueExpressionImpl.java:186)
15:44:16,925 ERROR [STDERR]     at com.sun.facelets.el.TagValueExpression.getVal
ue(TagValueExpression.java:71)
15:44:16,935 ERROR [STDERR]     at javax.faces.component.UIOutput.getValue(UIOut
put.java:184)
15:44:16,939 ERROR [STDERR]     at com.sun.faces.renderkit.html_basic.HtmlBasicI
nputRenderer.getValue(HtmlBasicInputRenderer.java:201)
15:44:16,944 ERROR [STDERR]     at com.sun.faces.renderkit.html_basic.HtmlBasicR
enderer.getCurrentValue(HtmlBasicRenderer.java:284)
15:44:16,948 ERROR [STDERR]     at com.sun.faces.renderkit.html_basic.HtmlBasicR
enderer.encodeEnd(HtmlBasicRenderer.java:154)
15:44:16,951 ERROR [STDERR]     at javax.faces.component.UIComponentBase.encodeE
nd(UIComponentBase.java:861)
15:44:16,955 ERROR [STDERR]     at com.sun.faces.renderkit.html_basic.HtmlBasicR
enderer.encodeRecursive(HtmlBasicRenderer.java:242)
15:44:16,961 ERROR [STDERR]     at com.sun.faces.renderkit.html_basic.TableRende
rer.renderRow(TableRenderer.java:312)
15:44:16,964 ERROR [STDERR]     at com.sun.faces.renderkit.html_basic.TableRende
rer.encodeChildren(TableRenderer.java:133)
15:44:16,968 ERROR [STDERR]     at javax.faces.component.UIComponentBase.encodeC
hildren(UIComponentBase.java:837)
15:44:16,971 ERROR [STDERR]     at org.jboss.seam.ui.util.JSF.renderChild(JSF.ja
va:175)
15:44:16,973 ERROR [STDERR]     at org.jboss.seam.ui.util.JSF.renderChildren(JSF
.java:163)
15:44:16,979 ERROR [STDERR]     at org.jboss.seam.mail.ui.MailComponent.encode(M
ailComponent.java:85)
15:44:16,984 ERROR [STDERR]     at org.jboss.seam.mail.ui.MailComponent.encode(M
ailComponent.java:59)
15:44:16,987 ERROR [STDERR]     at org.jboss.seam.mail.ui.UIBody.encodeChildren(
UIBody.java:44)
15:44:16,998 ERROR [STDERR]     at org.jboss.seam.ui.util.JSF.renderChild(JSF.ja
va:175)
15:44:17,001 ERROR [STDERR]     at org.jboss.seam.ui.util.JSF.renderChildren(JSF
.java:163)
15:44:17,004 ERROR [STDERR]     at org.jboss.seam.mail.ui.UIMessage.encodeChildr
en(UIMessage.java:165)
15:44:17,008 ERROR [STDERR]     at org.jboss.seam.ui.util.JSF.renderChild(JSF.ja
va:175)
15:44:17,013 ERROR [STDERR]     at org.jboss.seam.ui.util.JSF.renderChildren(JSF
.java:163)
15:44:17,017 ERROR [STDERR]     at org.jboss.seam.ui.facelet.FaceletsRenderer.re
nderFacelet(FaceletsRenderer.java:207)
15:44:17,020 ERROR [STDERR]     at org.jboss.seam.ui.facelet.FaceletsRenderer$1.
process(FaceletsRenderer.java:161)
15:44:17,023 ERROR [STDERR]     at org.jboss.seam.ui.facelet.FaceletsRenderer$Re
nderingContext.run(FaceletsRenderer.java:79)
15:44:17,028 ERROR [STDERR]     at org.jboss.seam.ui.facelet.FaceletsRenderer.re
nder(FaceletsRenderer.java:170)

--- snip ----

The code:

<h:dataTable value="#{training.mailTrainingParticipants}" var="trainingParticipant">
<h:column>
    <f:facet name="header">
        <h:outputText value="Name" />
    </f:facet>
    <h:outputText value="#{trainingParticipant.driver.surName}" />
</h:column>

<h:column>
    <f:facet name="header">
        <h:outputText value="Vorname" />
    </f:facet>
    <h:outputText value="#{trainingParticipant.driver.givenName}" />
</h:column>
</h:dataTable>

Anyone knows that problem or can me explain a workaroung displaying
array data in a mail component?

Thanks in advance...

Matthias

[mgoetz]

push

This is a big problem for me and i spent hours to search... perhaps its just a little mistake but i don't find it!

Thanks

Matthias

[danielc.roth]

bean code? (the async call etc)

[mgoetz]

Hi Daniel,

i have a standard async call following the mail example of seam. All the mailings work fine, the errors only occur with the dataTable. Perhaps the mail component does not generally support the dataTable function? So i don't think its a problem with the call.

Here is the async call...

     @Asynchronous
     public void sendCustomerWelcomeMail(@Duration long delay, Customer customer, Contact contact) {
        try {
             Contexts.getEventContext().set("customer", customer);
             Contexts.getEventContext().set("contact", contact);
             renderer.render("/customer/mail/welcome.xhtml");
        } catch (Exception e) {
             e.printStackTrace();
        }
     }

Thanks,

Matthias