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From "magdolna holitska" <mholits...@hotmail.com>
Subject Re: Drop down list issue when using EL
Date Wed, 17 Jan 2007 15:26:56 GMT
Hi Adam,

Indeed, the problem occurs when using tr:selectOneChoice or tr:inputText.
With tr:outputText there is no error, it works fine.


Here is the stack trace:

exception

javax.servlet.ServletException: /pages/Example.xhtml @16,55 
value="#{myBean.myObject.myProperty.myId}": Target Unreachable, 'myProperty' 
returned null
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:202)
	org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:97)
	org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._invokeDoFilter(TrinidadFilterImpl.java:327)
	org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:291)
	org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:214)
	org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:90)
	org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)
	com.iso_ne_on.foss.ui.util.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:98)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)


root cause

javax.faces.el.PropertyNotFoundException: /pages/Example.xhtml @16,55 
value="#{myBean.myObject.myProperty.myId}": Target Unreachable, 'myProperty' 
returned null
	com.sun.facelets.el.LegacyValueBinding.isReadOnly(LegacyValueBinding.java:84)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.EditableValueRenderer.getReadOnly(EditableValueRenderer.java:233)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.FormElementRenderer.renderAsElement(FormElementRenderer.java:174)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.InputLabelAndMessageRenderer.getLabelFor(InputLabelAndMessageRenderer.java:75)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.LabelAndMessageRenderer$Label.getForId(LabelAndMessageRenderer.java:600)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.OutputLabelRenderer.encodeAll(OutputLabelRenderer.java:84)
	org.apache.myfaces.trinidad.render.CoreRenderer.delegateRenderer(CoreRenderer.java:294)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.LabelAndMessageRenderer._renderLabelCell(LabelAndMessageRenderer.java:339)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.LabelAndMessageRenderer.encodeAll(LabelAndMessageRenderer.java:253)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.InputLabelAndMessageRenderer.encodeAll(InputLabelAndMessageRenderer.java:117)
	org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:181)
	org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:673)
	org.apache.myfaces.trinidad.render.RenderUtils.encodeRecursive(RenderUtils.java:67)
	org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:255)
	org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:277)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.PanelPartialRootRenderer.renderContent(PanelPartialRootRenderer.java:70)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.BodyRenderer.renderContent(BodyRenderer.java:134)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.PanelPartialRootRenderer.encodeAll(PanelPartialRootRenderer.java:150)
	org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.BodyRenderer.encodeAll(BodyRenderer.java:76)
	org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:181)
	org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:673)
	com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:252)
	com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:249)
	com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:249)
	com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:573)
	org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:178)
	com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
	com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
	org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:97)
	org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._invokeDoFilter(TrinidadFilterImpl.java:327)
	org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:291)
	org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:214)
	org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:90)
	org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)
	com.iso_ne_on.foss.ui.util.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:98)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)

Regards,
Magdolna




>From: "Adam Winer" <awiner@gmail.com>
>Reply-To: adffaces-user@incubator.apache.org
>To: adffaces-user@incubator.apache.org
>Subject: Re: Drop down list issue when using EL
>Date: Tue, 16 Jan 2007 15:54:30 -0800
>
>Can you provide a more complete stack trace?  I'm wondering
>if this is a problem with ValueBinding.isReadOnly() throwing
>an exception when ValueBinding.getValue() does not.  The
>only obvious difference between h: and tr:selectOneChoice
>is that tr:selectOneChoice uses ValueBinding.isReadOnly().
>
>-- Adam
>
>
>On 1/16/07, magdolna holitska <mholitska3@hotmail.com> wrote:
>>Hi again,
>>
>>Here is a little example for the problem I have.
>>
>>         <tr:selectOneChoice id="tr" unselectedLabel=""
>>                             value="#{myBean.myObject.myProperty.myId}"
>>                             contentStyle="width:10em">
>>             <f:selectItems value="#{myBean.myProperties}"/>
>>         </tr:selectOneChoice>
>>
>>If myBean.myObject.myProperty is null, I get an error in the UI:
>>         javax.servlet.ServletException
>>         Target Unreachable, 'myProperty ' returned null
>>
>>If I am replacing the Trinidad drop down list with regular JSF component,
>>"#{myBean.myObject.myProperty.myId}" resolves to null without a problem:
>>
>>         <h:selectOneMenu id="h" label="Normal Status" unselectedLabel=""
>>                             value="#{myBean.myObject.myProperty.myId}"
>>                             contentStyle="width:10em">
>>             <f:selectItems value="#{myBean.myProperties}"/>
>>         </h:selectOneMenu>
>>
>>Any idea why tr:selectOneChoice creates an exception instead of resolving
>>the value to null?
>>Is there a nice workaround?
>>
>>Thank you,
>>Magdolna
>>
>>
>>
>>
>>
>>
>> >From: "magdolna holitska" <mholitska3@hotmail.com>
>> >Reply-To: adffaces-user@incubator.apache.org
>> >To: adffaces-user@incubator.apache.org
>> >Subject: Re: Drop down list issue when using EL
>> >Date: Wed, 10 Jan 2007 11:52:05 -0500
>> >
>> >Hi Adam,
>> >
>> >Thanks a lot for the reply.
>> >The reason I tried that is to actually do a check for null value.
>> >
>> >In my code I have something like:
>> >       value="#{a.b.c}"
>> >
>> >As I understood from the EL documentation - if a.b is null, a.b.c should
>> >automatically resolve to null.
>> >
>> >However in my code, if a.b is null it fails with the error:
>> >       javax.servlet.ServletException:
>> >       ...
>> >       Target Unreachable, 'b' returned null
>> >       javax.faces.webapp.FacesServlet.service(FacesServlet.java:202)
>> >
>> >What would be the best way to get around it?
>> >Thanks again,
>> >
>> >Regards,
>> >Magdolna
>> >
>> >
>> >
>> >
>> >>From: "Adam Winer" <awiner@gmail.com>
>> >>Reply-To: adffaces-user@incubator.apache.org
>> >>To: adffaces-user@incubator.apache.org
>> >>Subject: Re: Drop down list issue when using EL
>> >>Date: Tue, 9 Jan 2007 16:19:20 -0800
>> >>
>> >>A value expression like #{true ? ... : ...} is not writable -
>> >>if you call ValueBinding.isReadOnly(), it returns true.
>> >>As a result, Trinidad automatically turns the
>> >>selectOneChoice to readOnly mode.
>> >>
>> >>For a writable EL expression, you have to just point
>> >>at a bean property.
>> >>
>> >>-- Adam
>> >>
>> >>
>> >>On 1/9/07, magdolna holitska <mholitska3@hotmail.com> wrote:
>> >>>Hi all,
>> >>>I have a drop down list and I am trying to set the value selectively.
>> >>>Whenever I use EL in the code, the drop down list disappears and 
>>instead,
>> >>>it
>> >>>has the appearance of an output text.
>> >>>Any hints?
>> >>>
>> >>>Thank you,
>> >>>Magdolna
>> >>>
>> >>>
>> >>>Here is a simple example:
>> >>><tr:selectOneChoice id="ex" label="Example" value="#{true ? 'L1' :
>> >>>'L2'}">
>> >>>         <tr:selectItem label="L1" value="L1"/>
>> >>>         <tr:selectItem label="L2" value="L2"/>
>> >>>         <tr:selectItem label="L3" value="L3"/>
>> >>></tr:selectOneChoice>
>> >>>
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