Let me correct something I said: the action method is getting
called!!! –– I was just confused the first time I looked.
Anyways, the action method gets called and then that action method is
calling performParentAction as follows:
return performParentAction(s);
I did not write that component and I rarely use the
performParentAction. But that is returning null. And that is the
value my component gets at line#113 and returns the page instead (is
that bad? should I return the null value instead?).
Then if I resume execution I get the null pointer exception in
_popComponentFromContext() in WebObjects.
Still investigating...
On Jun 25, 2009, at 10:59 PM, Ricardo J. Parada wrote:
Well here's what I'm seeing... my component determines that it is
the one that should invoke the action and goes through this code:
// Tell context that an action was performed. If this is
// not done, the form's default action will be called also.
111: wocontext.setActionInvoked(true);
112:
113: WOActionResults obj = (WOActionResults)
valueForBinding(ACTION_BINDING_KEY);
114: if (obj == null) obj = wocontext.page();
115:
116: return obj;
Line # 113 should be calling the action method that is bound to the
action binding. That is the method on which I set the breakpoint
that I was referring to earlier. The one I never hit. So if I
don't hit the breakpoint then it's not calling it. But it is
calling something else because I see stuff show on the console every
time I evaluate the expression valueForBinding(ACTION_BINDING_KEY).
Anyways, I'll try to investigate what is getting called... or maybe
take a look at valueForBinding to find out why it's not calling the
right thing.
If I evaluate the expression
_associationWithName(ACTION_BINDING_KEY) in the debugger right after
line #113 I get the following:
(ognl.helperfunction.WOHelperFunctionBindingNameAssociation)
<ognl.helperfunction.WOHelperFunctionBindingNameAssociation:
keyPath=^action>
On Jun 25, 2009, at 10:19 PM, Chuck Hill wrote:
On Jun 25, 2009, at 7:10 PM, Ricardo J. Parada wrote:
On Jun 25, 2009, at 9:53 PM, Chuck Hill wrote:
Sigh...
Does anybody see anything obvious in this stack trace? I used
to have this exception ages ago and it was obscure. I don't
recall what ended up fixing it exactly but now that I moved my
application to Wonder I'm running into this again and haven't
figured out yet why or how to fix it. Any ideas??
Pleeeassee!! :-)
I have seen this before. It is caused by the context not
knowing the current component. This is hitting some action
method. What is it returning?
I see in the stack trace that it's going through the invokeAction
phase. But the action method that is supposed to get called has
not been called yet. I set a breakpoint in the method that it's
supposed to get called but I hit the exception first and the
action method never gets called.
I'll set a breakpoint in the invokeAction() method of the
component that is supposed to call the action to see how things
look from there.
From what I can tell the _popComponentFromContext() gets the
current component from the context and then to message it and
throws the null pointer exception because the current component is
null for some obscure reason.
Anyways, I'm taking a look at the invokeAction in my component.
I really ought to take better notes when I hit things like this.
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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