Ah, thanks for the example! It was obvious right away what I was doing
wrong. Turned out to be I simply forgot the t:zone parameter for the
Form and ActionLink components encapsulated by the Zone, which would
explain why Tapestry had been complaining when I was doing
zone.getBody() as returns from the Event methods before.
Thanks,
Rich
On 02/23/2011 02:49 PM, Josh Canfield wrote:
Hi,
I'm getting the following error
I can't reproduce the error. Can you create a cut down version that
causes the problem?
Here is my attempt to recreate.
@Property
private String blockId = "one";
@Component
private Zone blockZone;
@Component
private Form oneForm;
@Property
private String oneText;
@Component
private Form twoForm;
@Property
private String twoText;
@Inject
private ComponentResources resources;
public Block onSuccessFromOneForm() {
blockId = "two";
return blockZone.getBody();
}
public Block onSuccessFromTwoForm() {
blockId = "one";
return blockZone.getBody();
}
public Block getTheBlock() {
return resources.getBlock(blockId);
}
<t:zone t:id="blockZone">
<t:delegate to="theBlock"/>
<t:block t:id="one">
<t:form t:id="oneForm" t:zone="blockZone">
<t:label for="oneText">One</t:label>
<t:textfield t:id="oneText"/>
<t:submit/>
</t:form>
</t:block>
<t:block t:id="two">
<t:form t:id="twoForm" t:zone="blockZone">
<t:label for="twoText">Two</t:label>
<t:textfield t:id="twoText"/>
<t:submit/>
</t:form>
</t:block>
</t:zone>
Josh
On Wed, Feb 23, 2011 at 10:52 AM, Rich M<rich...@moremagic.com> wrote:
Hi,
I'm getting the following error
Caused by: java.lang.NullPointerException
at
org.apache.tapestry5.corelib.components.Form._$environment_read_renderSupport(Form.java)
at
org.apache.tapestry5.corelib.components.Form.beginRender(Form.java:245)
at org.apache.tapestry5.corelib.components.Form.beginRender(Form.java)
when I re-render the main zone in my page from an ActionLink or FormSuccess
event method.
More about my page:
The page is divided into 8 blocks, and 6 of the blocks encapsulate a form,
as such:
<zone>
<delegate />
<block>
<form>
</form>
<block>
...
<block>
<form>
</form>
</block>
</zone>
When first loading the page, it delegates to the first block. You can fill
out the form and then submit the form. Upon submitting the form, it triggers
the onSuccessFromForm method, which updates the Block for the Delegate and
returns the zone component.
At this point, I get the NullPointerError which points directly to the line
in the TML file declaring the<t:form> in the Block that should now be
delegated to. I declare the t:id of the form and in the page class each Form
is declared as a private Form with the @Component annotation.
Any help or advice would be appreciated. I have used the
Zone/Block/Event-Method strategy in another Component of mine successfully,
but the Blocks in that Component never contained Form components, which
seems to be the added complication.
Also, I had the Events working when I just returned the page class itself by
String reference, but I'd prefer to update the Zone over reload the Page
each time.
Thanks,
Rich
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