Setting injected page as initial-value for another property

[Alexander Kundirenko <ak...@gmail.com>]

Hi All,
I want my FormPage to have customizable return page.
Here is the simplified code:

==== FORM PAGE CLASS =====        
         **
	 * @return page instance
	 * We redirect here after form saving
	 */
	public abstract IPage getReturnPage();		
	public abstract void setReturnPage(IPage page);	
		
	public abstract IPage getDefaultReturnPage();
==========================

===== FORM PAGE SPEC ======
    <inject property="defaultReturnPage" type="page"
object="StudentForm"/>
    <property name="returnPage" persist="session"
initial-value="defaultReturnPage"/>
===========================

But I get next error:
===========================
org.apache.tapestry.BindingException
Unable to read OGNL expression '<parsed OGNL expression>' of
$FormPage_1240@b24098[TestResultForm]: defaultReturnPage
...
ognl.OgnlException
defaultReturnPage
...
java.lang.NullPointerException
Stack Trace:

    * $FormPage_1240.getDefaultReturnPage($FormPage_1240.java)
    * sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    * sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    * sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    * java.lang.reflect.Method.invoke(Method.java:585)
    * ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:491)
    * ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:904)
===========================

When I remove "initial-value" attribute - all works fine. Also I can
reference to that injected page in runtime, so I think that the
problem is in "initial-value" attribute processing.
Or I can't use injected page as initial-value for another property?
You can find full trace in attachment.

Thank you, 
  Alex

Re: Setting injected page as initial-value for another property

[Howard Lewis Ship <hl...@gmail.com>]

Tapestry does not support this.  This would be considered a permanent
reference between pages, which doesn't work with Tapestry page pooling
mechanism.

You should store page names and resolve them dynamically using the
IRequestCycle.

On 8/15/05, Alexander Kundirenko <ak...@gmail.com> wrote:
> Hi All,
> I want my FormPage to have customizable return page.
> Here is the simplified code:
> 
> ==== FORM PAGE CLASS =====
>          **
>          * @return page instance
>          * We redirect here after form saving
>          */
>         public abstract IPage getReturnPage();
>         public abstract void setReturnPage(IPage page);
> 
>         public abstract IPage getDefaultReturnPage();
> ==========================
> 
> ===== FORM PAGE SPEC ======
>     <inject property="defaultReturnPage" type="page"
> object="StudentForm"/>
>     <property name="returnPage" persist="session"
> initial-value="defaultReturnPage"/>
> ===========================
> 
> But I get next error:
> ===========================
> org.apache.tapestry.BindingException
> Unable to read OGNL expression '<parsed OGNL expression>' of
> $FormPage_1240@b24098[TestResultForm]: defaultReturnPage
> ...
> ognl.OgnlException
> defaultReturnPage
> ...
> java.lang.NullPointerException
> Stack Trace:
> 
>     * $FormPage_1240.getDefaultReturnPage($FormPage_1240.java)
>     * sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     * sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>     * sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     * java.lang.reflect.Method.invoke(Method.java:585)
>     * ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:491)
>     * ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:904)
> ===========================
> 
> When I remove "initial-value" attribute - all works fine. Also I can
> reference to that injected page in runtime, so I think that the
> problem is in "initial-value" attribute processing.
> Or I can't use injected page as initial-value for another property?
> You can find full trace in attachment.
> 
> Thank you,
>   Alex
> 
> 
> 
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> 


-- 
Howard M. Lewis Ship
Independent J2EE / Open-Source Java Consultant
Creator, Jakarta Tapestry
Creator, Jakarta HiveMind

Professional Tapestry training, mentoring, support
and project work.  http://howardlewisship.com

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