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Date: Tue, 17 Mar 2009 14:37:50 -0700 (PDT)
From: "Thiago H. de Paula Figueiredo (JIRA)" <jira@apache.org>
To: commits@tapestry.apache.org
Subject: [jira] Commented: (TAP5-573) NullPointerException during AJAX form
 submit
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    [ https://issues.apache.org/jira/browse/TAP5-573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682817#action_12682817 ] 

Thiago H. de Paula Figueiredo commented on TAP5-573:
----------------------------------------------------

"You should be returning the zone's body (getFormZone().getBody()) to update the Zone after submission (in Ajax mode)."

That's something new to me. The documentation just says that the event handler must return a component, and Zone is a component. I've doing this for a long time (since T5 has Zones, actually) and this exception only ocurrs with 5.1.0.0+, not with 5.0.18 or past versions. Maybe we should update the docs. Anyway, shouldn't Tapestry handle a Zone event handler return? 

> NullPointerException during AJAX form submit
> --------------------------------------------
>
>                 Key: TAP5-573
>                 URL: https://issues.apache.org/jira/browse/TAP5-573
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-core
>    Affects Versions: 5.1.0.1
>            Reporter: Thiago H. de Paula Figueiredo
>            Assignee: Howard M. Lewis Ship
>            Priority: Critical
>
> To reproduce this bug:
> * Checkout the Ars Machina Example Project from SVN: https://ars-machina.svn.sourceforge.net/svnroot/ars-machina/example/branches/1.1
> * Run its Main class (default package)
> * Click in the login link
> * Login as manager (login) manager (password)
> * Click in the project listings link
> * Click in one of the edition links (the second icon)
> * Click the submit button.
> Relevant part of the stack trace:
> java.lang.NullPointerException
> 	at org.apache.tapestry5.dom.Element.createNamespaceURIToPrefix(Element.java:676)
> 	at org.apache.tapestry5.dom.Element.toMarkup(Element.java:333)
> 	at org.apache.tapestry5.dom.Element.writeChildMarkup(Element.java:870)
> 	at org.apache.tapestry5.dom.Element.toMarkup(Element.java:386)
> 	at org.apache.tapestry5.dom.Element.writeChildMarkup(Element.java:870)
> 	at org.apache.tapestry5.dom.Element.toMarkup(Element.java:386)
> 	at org.apache.tapestry5.dom.Element.writeChildMarkup(Element.java:870)
> 	at org.apache.tapestry5.dom.Element.getChildMarkup(Element.java:883)
> 	at org.apache.tapestry5.internal.services.PageRenderQueueImpl.renderPartial(PageRenderQueueImpl.java:163)

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