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Posted to users@tapestry.apache.org by Petter Måhlén <pe...@elevance.se> on 2004/04/12 23:16:27 UTC
Null parameter during form rewind
Hi,
I am getting an exception that I don't understand how to deal with, a
"source is null for getProperty(null, "workDate")", during the rewind phase.
The (nearly) full stack trace is at the end of the email. Maybe I have an
unnecessarily complicated structure. First, there is a component
(ReportTable) with the following .html:
---
<table>
<tr>
<td class="tableheader"><span jwcid="@Insert" value="ognl:heading"
/></td>
</tr>
<tr jwcid="workdays">
<td jwcid="@WorkDayReport" workDay="ognl:workDay" />
</tr>
</table>
---
In the .jwc, the 'workdays' component and 'workDay' property are specified
as:
---
<property-specification name="workDay"
type="se.elevance.timer.data.WorkDay" persistent="no" />
<component id="workdays" type="Foreach">
<binding name="source" expression="workDayList"/>
<binding name="value" expression="workDay"/>
<static-binding name="element" value="tr"/>
</component>
---
WorkDayReport.jwc contains this parameter specification:
---
<parameter name="workDay" type="se.elevance.timer.data.WorkDay"
direction="in" required="yes">
<description>
The working day to present reporting options for.
</description>
</parameter>
---
The line in the .html file that causes the BindingException ("Unable to
resolve expression 'workDay.workDate' for
se.elevance.timer.web.WorkDayReport$Enhance_26@
1e2c841[Report/newReports.$WorkDayReport]") refers to the workDay parameter.
And since that is required, I don't see that it can be null?
This seems to be similar to one or two other times when I have run into
problems because the order of initialisation of nested components is not
well defined. Could the problem be that the ReportTable component, which
contains the Foreach, has not yet been properly initialised when the form's
rewind() method is called? Meaning that the workDay property in the
ReportTable is not bound to anything yet?
I seem to be running into this type of problems a lot, so presumably I am
missing something fundamental about how Tapestry deals with component
parameters and nested components. Hopefully somebody can point me to a
better way of dealing with it.
Thanks,
Petter
----
Stack Trace:
ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1435)
ognl.ASTProperty.getValueBody(ASTProperty.java:96)
ognl.SimpleNode.getValue(SimpleNode.java:192)
ognl.ASTChain.getValueBody(ASTChain.java:109)
ognl.SimpleNode.getValue(SimpleNode.java:192)
ognl.Ognl.getValue(Ognl.java:335)
ognl.Ognl.getValue(Ognl.java:310)
org.apache.tapestry.binding.ExpressionBinding.resolveProperty(ExpressionBind
ing.java:201)
org.apache.tapestry.binding.ExpressionBinding.getObject(ExpressionBinding.ja
va:194)
org.apache.tapestry.binding.AbstractBinding.getObject(AbstractBinding.java:2
08)
org.apache.tapestry.param.AbstractParameterConnector.getBindingValue(Abstrac
tParameterConnector.java:105)
org.apache.tapestry.param.ObjectParameterConnector.setParameter(ObjectParame
terConnector.java:53)
org.apache.tapestry.param.ParameterManager.setParameters(ParameterManager.ja
va:105)
org.apache.tapestry.AbstractComponent.prepareForRender(AbstractComponent.jav
a:898)
org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:853)
org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:624)
org.apache.tapestry.form.Form.renderComponent(Form.java:362)
org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:857)
org.apache.tapestry.form.Form.rewind(Form.java:568)
org.apache.tapestry.engine.RequestCycle.rewindForm(RequestCycle.java:435)
org.apache.tapestry.form.Form.trigger(Form.java:582)
org.apache.tapestry.engine.DirectService.service(DirectService.java:169)
org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:872)
org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:197
)
org.apache.tapestry.ApplicationServlet.doPost(ApplicationServlet.java:326)
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RE: Null parameter during form rewind
Posted by Petter Måhlén <pe...@elevance.se>.
Hi again,
I keep trying to understand this, and if I have pieced things together
correctly, it seems like the following things happen when a form is posted
(stuff happens before and after as well, of course):
1. DirectService.service is invoked. This method locates the form on the
page and retrieves an instance of the object. As far as I can tell, in my
case, there will be only one instance named $WorkDayReport.form on the page,
but that should be OK.
2. Form.trigger() is invoked for the form instance.
3. RequestCycle.rewindForm() is invoked with the form instance as a
parameter.
4. Form.rewind() is invoked for the form instance.
5. AbstractComponent.render() is invoked for the form instance.
6. Form.prepareForRender() is invoked for the form instance.
7. AbstractComponent.prepareForRender() is invoked, which tries to set
parameters for the parameter manager and fails.
In this chain, the containing components (in particular the Foreach) are
never initialised with a call to prepareForRender(). This call would have
set up its parameters, and made the parameter used by the form valid. During
the render cycle, AbstractPage.renderPage is called, which starts rendering
from the top rather than from the form component and therefore ensures that
parameter initialisation is done from top to bottom.
Questions for the gurus:
1. Is this a correct description of what happens or am I missing something?
2. If so, is it intentional or a bug? It seems like a bug to me, because
what it means is that if a form is nested inside a component, parameters of
the surrounding component cannot be accessed during the rewind cycle.
/ Petter
> -----Original Message-----
> From: Petter Måhlén [mailto:petter.mahlen@elevance.se]
> Sent: den 13 april 2004 10:55
> To: 'Tapestry users'
> Subject: RE: Null parameter during form rewind
>
>
> Hm, as far as I can understand from quickly looking at the
> OGNL source, the
> exception means that I am trying to retrieve the value for
> 'workDate' from a
> null object.
>
> That is borne out by something that I tried. I noticed that while the
> prepareForRender() method of the component is not called
> before the form
> starts rewinding, the pageBeginRender() method is. So I added
> this extremely
> ugly hack to pageBeginRender(), and it no longer crashes (and
> a new WorkDay
> instance in fact has a null workDate):
>
> if (getWorkDay() == null) {
> setWorkDay(new WorkDay());
> }
>
> So I still think that the workDay parameter has not been
> bound to the value
> of the Foreach when the form tries to initialise its
> ParameterManager. But
> this is a part of Tapestry that I am having problems
> understanding, so it's
> quite likely that I'm wrong. Incidentally, I have also tried
> both 'form' and
> 'auto' directions for the workDay parameter, without any
> difference. This
> seems like a bug to me, but I'm not sure.
>
> / Petter
>
> > -----Original Message-----
> > From: Shawn Church [mailto:shawn@boxity.com]
> > Sent: den 13 april 2004 02:40
> > To: Tapestry users
> > Subject: RE: Null parameter during form rewind
> >
> >
> > Petter,
> >
> > I'm new to OGNL/Tapestry, but it appears the null is not
> > workDay but the
> > workDay.workDate attribute. Does the WorkDayReport
> component refer to
> > workDate? I don't think workDay can be null, since it is
> > bound to the value
> > of Foreach. Can your getWorkDate() method ensure it doesn't
> > return null?
> > From my limited experience with OGNL, it seems to be pretty
> > null intolerant.
> >
> > Shawn
> >
> > -----Original Message-----
> > From: Petter Måhlén [mailto:petter.mahlen@elevance.se]
> > Sent: Monday, April 12, 2004 4:16 PM
> > To: Tapestry-User
> > Subject: Null parameter during form rewind
> >
> >
> > Hi,
> >
> > I am getting an exception that I don't understand how to
> deal with, a
> > "source is null for getProperty(null, "workDate")", during
> > the rewind phase.
> > The (nearly) full stack trace is at the end of the email.
> > Maybe I have an
> > unnecessarily complicated structure. First, there is a component
> > (ReportTable) with the following .html:
> >
> > ---
> > <table>
> > <tr>
> > <td class="tableheader"><span jwcid="@Insert"
> value="ognl:heading"
> > /></td>
> > </tr>
> > <tr jwcid="workdays">
> > <td jwcid="@WorkDayReport" workDay="ognl:workDay" />
> > </tr>
> > </table>
> > ---
> >
> > In the .jwc, the 'workdays' component and 'workDay' property
> > are specified
> > as:
> > ---
> > <property-specification name="workDay"
> > type="se.elevance.timer.data.WorkDay" persistent="no" />
> >
> > <component id="workdays" type="Foreach">
> > <binding name="source" expression="workDayList"/>
> > <binding name="value" expression="workDay"/>
> > <static-binding name="element" value="tr"/>
> > </component>
> > ---
> >
> > WorkDayReport.jwc contains this parameter specification:
> > ---
> > <parameter name="workDay" type="se.elevance.timer.data.WorkDay"
> > direction="in" required="yes">
> > <description>
> > The working day to present reporting options for.
> > </description>
> > </parameter>
> > ---
> >
> > The line in the .html file that causes the BindingException
> > ("Unable to
> > resolve expression 'workDay.workDate' for
> > se.elevance.timer.web.WorkDayReport$Enhance_26@
> > 1e2c841[Report/newReports.$WorkDayReport]") refers to the
> > workDay parameter.
> > And since that is required, I don't see that it can be null?
> >
> > This seems to be similar to one or two other times when I
> > have run into
> > problems because the order of initialisation of nested
> > components is not
> > well defined. Could the problem be that the ReportTable
> > component, which
> > contains the Foreach, has not yet been properly initialised
> > when the form's
> > rewind() method is called? Meaning that the workDay property in the
> > ReportTable is not bound to anything yet?
> >
> > I seem to be running into this type of problems a lot, so
> > presumably I am
> > missing something fundamental about how Tapestry deals with
> component
> > parameters and nested components. Hopefully somebody can
> point me to a
> > better way of dealing with it.
> >
> > Thanks,
> >
> > Petter
> >
> >
> > ----
> > Stack Trace:
> > ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1435)
> > ognl.ASTProperty.getValueBody(ASTProperty.java:96)
> > ognl.SimpleNode.getValue(SimpleNode.java:192)
> > ognl.ASTChain.getValueBody(ASTChain.java:109)
> > ognl.SimpleNode.getValue(SimpleNode.java:192)
> > ognl.Ognl.getValue(Ognl.java:335)
> > ognl.Ognl.getValue(Ognl.java:310)
> > org.apache.tapestry.binding.ExpressionBinding.resolveProperty(
> > ExpressionBind
> > ing.java:201)
> > org.apache.tapestry.binding.ExpressionBinding.getObject(Expres
> > sionBinding.ja
> > va:194)
> > org.apache.tapestry.binding.AbstractBinding.getObject(Abstract
> > Binding.java:2
> > 08)
> > org.apache.tapestry.param.AbstractParameterConnector.getBindin
> > gValue(Abstrac
> > tParameterConnector.java:105)
> > org.apache.tapestry.param.ObjectParameterConnector.setParamete
> > r(ObjectParame
> > terConnector.java:53)
> > org.apache.tapestry.param.ParameterManager.setParameters(Param
> > eterManager.ja
> > va:105)
> > org.apache.tapestry.AbstractComponent.prepareForRender(Abstrac
> > tComponent.jav
> > a:898)
> > org.apache.tapestry.AbstractComponent.render(AbstractComponent
> > .java:853)
> > org.apache.tapestry.AbstractComponent.renderBody(AbstractCompo
> > nent.java:624)
> >
> > org.apache.tapestry.form.Form.renderComponent(Form.java:362)
> > org.apache.tapestry.AbstractComponent.render(AbstractComponent
> > .java:857)
> > org.apache.tapestry.form.Form.rewind(Form.java:568)
> > org.apache.tapestry.engine.RequestCycle.rewindForm(RequestCycl
> > e.java:435)
> > org.apache.tapestry.form.Form.trigger(Form.java:582)
> > org.apache.tapestry.engine.DirectService.service(DirectService
> > .java:169)
> > org.apache.tapestry.engine.AbstractEngine.service(AbstractEngi
> > ne.java:872)
> > org.apache.tapestry.ApplicationServlet.doService(ApplicationSe
> > rvlet.java:197
> > )
> > org.apache.tapestry.ApplicationServlet.doPost(ApplicationServl
> > et.java:326)
> >
> >
> >
> >
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> > To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail:
> tapestry-user-help@jakarta.apache.org
> >
> >
> >
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> > For additional commands, e-mail:
> tapestry-user-help@jakarta.apache.org
> >
>
>
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> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>
---------------------------------------------------------------------
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RE: Null parameter during form rewind
Posted by Petter Måhlén <pe...@elevance.se>.
Hm, as far as I can understand from quickly looking at the OGNL source, the
exception means that I am trying to retrieve the value for 'workDate' from a
null object.
That is borne out by something that I tried. I noticed that while the
prepareForRender() method of the component is not called before the form
starts rewinding, the pageBeginRender() method is. So I added this extremely
ugly hack to pageBeginRender(), and it no longer crashes (and a new WorkDay
instance in fact has a null workDate):
if (getWorkDay() == null) {
setWorkDay(new WorkDay());
}
So I still think that the workDay parameter has not been bound to the value
of the Foreach when the form tries to initialise its ParameterManager. But
this is a part of Tapestry that I am having problems understanding, so it's
quite likely that I'm wrong. Incidentally, I have also tried both 'form' and
'auto' directions for the workDay parameter, without any difference. This
seems like a bug to me, but I'm not sure.
/ Petter
> -----Original Message-----
> From: Shawn Church [mailto:shawn@boxity.com]
> Sent: den 13 april 2004 02:40
> To: Tapestry users
> Subject: RE: Null parameter during form rewind
>
>
> Petter,
>
> I'm new to OGNL/Tapestry, but it appears the null is not
> workDay but the
> workDay.workDate attribute. Does the WorkDayReport component refer to
> workDate? I don't think workDay can be null, since it is
> bound to the value
> of Foreach. Can your getWorkDate() method ensure it doesn't
> return null?
> From my limited experience with OGNL, it seems to be pretty
> null intolerant.
>
> Shawn
>
> -----Original Message-----
> From: Petter Måhlén [mailto:petter.mahlen@elevance.se]
> Sent: Monday, April 12, 2004 4:16 PM
> To: Tapestry-User
> Subject: Null parameter during form rewind
>
>
> Hi,
>
> I am getting an exception that I don't understand how to deal with, a
> "source is null for getProperty(null, "workDate")", during
> the rewind phase.
> The (nearly) full stack trace is at the end of the email.
> Maybe I have an
> unnecessarily complicated structure. First, there is a component
> (ReportTable) with the following .html:
>
> ---
> <table>
> <tr>
> <td class="tableheader"><span jwcid="@Insert" value="ognl:heading"
> /></td>
> </tr>
> <tr jwcid="workdays">
> <td jwcid="@WorkDayReport" workDay="ognl:workDay" />
> </tr>
> </table>
> ---
>
> In the .jwc, the 'workdays' component and 'workDay' property
> are specified
> as:
> ---
> <property-specification name="workDay"
> type="se.elevance.timer.data.WorkDay" persistent="no" />
>
> <component id="workdays" type="Foreach">
> <binding name="source" expression="workDayList"/>
> <binding name="value" expression="workDay"/>
> <static-binding name="element" value="tr"/>
> </component>
> ---
>
> WorkDayReport.jwc contains this parameter specification:
> ---
> <parameter name="workDay" type="se.elevance.timer.data.WorkDay"
> direction="in" required="yes">
> <description>
> The working day to present reporting options for.
> </description>
> </parameter>
> ---
>
> The line in the .html file that causes the BindingException
> ("Unable to
> resolve expression 'workDay.workDate' for
> se.elevance.timer.web.WorkDayReport$Enhance_26@
> 1e2c841[Report/newReports.$WorkDayReport]") refers to the
> workDay parameter.
> And since that is required, I don't see that it can be null?
>
> This seems to be similar to one or two other times when I
> have run into
> problems because the order of initialisation of nested
> components is not
> well defined. Could the problem be that the ReportTable
> component, which
> contains the Foreach, has not yet been properly initialised
> when the form's
> rewind() method is called? Meaning that the workDay property in the
> ReportTable is not bound to anything yet?
>
> I seem to be running into this type of problems a lot, so
> presumably I am
> missing something fundamental about how Tapestry deals with component
> parameters and nested components. Hopefully somebody can point me to a
> better way of dealing with it.
>
> Thanks,
>
> Petter
>
>
> ----
> Stack Trace:
> ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1435)
> ognl.ASTProperty.getValueBody(ASTProperty.java:96)
> ognl.SimpleNode.getValue(SimpleNode.java:192)
> ognl.ASTChain.getValueBody(ASTChain.java:109)
> ognl.SimpleNode.getValue(SimpleNode.java:192)
> ognl.Ognl.getValue(Ognl.java:335)
> ognl.Ognl.getValue(Ognl.java:310)
> org.apache.tapestry.binding.ExpressionBinding.resolveProperty(
> ExpressionBind
> ing.java:201)
> org.apache.tapestry.binding.ExpressionBinding.getObject(Expres
> sionBinding.ja
> va:194)
> org.apache.tapestry.binding.AbstractBinding.getObject(Abstract
> Binding.java:2
> 08)
> org.apache.tapestry.param.AbstractParameterConnector.getBindin
> gValue(Abstrac
> tParameterConnector.java:105)
> org.apache.tapestry.param.ObjectParameterConnector.setParamete
> r(ObjectParame
> terConnector.java:53)
> org.apache.tapestry.param.ParameterManager.setParameters(Param
> eterManager.ja
> va:105)
> org.apache.tapestry.AbstractComponent.prepareForRender(Abstrac
> tComponent.jav
> a:898)
> org.apache.tapestry.AbstractComponent.render(AbstractComponent
> .java:853)
> org.apache.tapestry.AbstractComponent.renderBody(AbstractCompo
> nent.java:624)
>
> org.apache.tapestry.form.Form.renderComponent(Form.java:362)
> org.apache.tapestry.AbstractComponent.render(AbstractComponent
> .java:857)
> org.apache.tapestry.form.Form.rewind(Form.java:568)
> org.apache.tapestry.engine.RequestCycle.rewindForm(RequestCycl
> e.java:435)
> org.apache.tapestry.form.Form.trigger(Form.java:582)
> org.apache.tapestry.engine.DirectService.service(DirectService
> .java:169)
> org.apache.tapestry.engine.AbstractEngine.service(AbstractEngi
> ne.java:872)
> org.apache.tapestry.ApplicationServlet.doService(ApplicationSe
> rvlet.java:197
> )
> org.apache.tapestry.ApplicationServlet.doPost(ApplicationServl
> et.java:326)
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>
>
> ---------------------------------------------------------------------
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> For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
>
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RE: Null parameter during form rewind
Posted by Shawn Church <sh...@boxity.com>.
Petter,
I'm new to OGNL/Tapestry, but it appears the null is not workDay but the
workDay.workDate attribute. Does the WorkDayReport component refer to
workDate? I don't think workDay can be null, since it is bound to the value
of Foreach. Can your getWorkDate() method ensure it doesn't return null?
>From my limited experience with OGNL, it seems to be pretty null intolerant.
Shawn
-----Original Message-----
From: Petter Måhlén [mailto:petter.mahlen@elevance.se]
Sent: Monday, April 12, 2004 4:16 PM
To: Tapestry-User
Subject: Null parameter during form rewind
Hi,
I am getting an exception that I don't understand how to deal with, a
"source is null for getProperty(null, "workDate")", during the rewind phase.
The (nearly) full stack trace is at the end of the email. Maybe I have an
unnecessarily complicated structure. First, there is a component
(ReportTable) with the following .html:
---
<table>
<tr>
<td class="tableheader"><span jwcid="@Insert" value="ognl:heading"
/></td>
</tr>
<tr jwcid="workdays">
<td jwcid="@WorkDayReport" workDay="ognl:workDay" />
</tr>
</table>
---
In the .jwc, the 'workdays' component and 'workDay' property are specified
as:
---
<property-specification name="workDay"
type="se.elevance.timer.data.WorkDay" persistent="no" />
<component id="workdays" type="Foreach">
<binding name="source" expression="workDayList"/>
<binding name="value" expression="workDay"/>
<static-binding name="element" value="tr"/>
</component>
---
WorkDayReport.jwc contains this parameter specification:
---
<parameter name="workDay" type="se.elevance.timer.data.WorkDay"
direction="in" required="yes">
<description>
The working day to present reporting options for.
</description>
</parameter>
---
The line in the .html file that causes the BindingException ("Unable to
resolve expression 'workDay.workDate' for
se.elevance.timer.web.WorkDayReport$Enhance_26@
1e2c841[Report/newReports.$WorkDayReport]") refers to the workDay parameter.
And since that is required, I don't see that it can be null?
This seems to be similar to one or two other times when I have run into
problems because the order of initialisation of nested components is not
well defined. Could the problem be that the ReportTable component, which
contains the Foreach, has not yet been properly initialised when the form's
rewind() method is called? Meaning that the workDay property in the
ReportTable is not bound to anything yet?
I seem to be running into this type of problems a lot, so presumably I am
missing something fundamental about how Tapestry deals with component
parameters and nested components. Hopefully somebody can point me to a
better way of dealing with it.
Thanks,
Petter
----
Stack Trace:
ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1435)
ognl.ASTProperty.getValueBody(ASTProperty.java:96)
ognl.SimpleNode.getValue(SimpleNode.java:192)
ognl.ASTChain.getValueBody(ASTChain.java:109)
ognl.SimpleNode.getValue(SimpleNode.java:192)
ognl.Ognl.getValue(Ognl.java:335)
ognl.Ognl.getValue(Ognl.java:310)
org.apache.tapestry.binding.ExpressionBinding.resolveProperty(ExpressionBind
ing.java:201)
org.apache.tapestry.binding.ExpressionBinding.getObject(ExpressionBinding.ja
va:194)
org.apache.tapestry.binding.AbstractBinding.getObject(AbstractBinding.java:2
08)
org.apache.tapestry.param.AbstractParameterConnector.getBindingValue(Abstrac
tParameterConnector.java:105)
org.apache.tapestry.param.ObjectParameterConnector.setParameter(ObjectParame
terConnector.java:53)
org.apache.tapestry.param.ParameterManager.setParameters(ParameterManager.ja
va:105)
org.apache.tapestry.AbstractComponent.prepareForRender(AbstractComponent.jav
a:898)
org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:853)
org.apache.tapestry.AbstractComponent.renderBody(AbstractComponent.java:624)
org.apache.tapestry.form.Form.renderComponent(Form.java:362)
org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:857)
org.apache.tapestry.form.Form.rewind(Form.java:568)
org.apache.tapestry.engine.RequestCycle.rewindForm(RequestCycle.java:435)
org.apache.tapestry.form.Form.trigger(Form.java:582)
org.apache.tapestry.engine.DirectService.service(DirectService.java:169)
org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:872)
org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:197
)
org.apache.tapestry.ApplicationServlet.doPost(ApplicationServlet.java:326)
---------------------------------------------------------------------
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For additional commands, e-mail: tapestry-user-help@jakarta.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: tapestry-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tapestry-user-help@jakarta.apache.org