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Re: Help using EditLink component
by Alejandro Scandroli
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Hi Chris
The first error is due to the ognl expression This is how you
reference a class from ognl:
"ognl:@gov.nasa.jpl.edrn.Participant@class"
http://www.ognl.org/2.6.9/Documentation/html/LanguageGuide/staticMethods.html
You are right, the EditLink expects an hibernate entity so that code
won't work. You can try something like this
<a href="#" jwcid="@trails:EditLink"
model="ognl:page.persistenceService.getInstance(@gov.nasa.jpl.edrn.Participant@class,
1)" >
Edit Participant Nº 1
</a>
That should work, but I have never tried it.
I think that the NewLink component is what you are looking for.
Try with this:
<a class="newlink" href="#" jwcid="@trails:NewLink"
type="ognl:@gov.nasa.jpl.edrn.Participant@class">Add a New
Participant</a>
I know Trails lacks good documentation :( ,and I'm responsible for
that, so this mailing list is the best way to get some help.
Hope this helps.
Let me know how it goes.
Saludos.
Alejandro.
--
Alejandro Scandroli - http://weblog.amneris.es/
Amneris: We build process-driven web applications.
http://www.amneris.es
On Sun, Mar 9, 2008 at 4:04 AM, Chris Mattmann
<chris.mattmann@...> wrote:
> Hi Guys,
>
> How are ya? I have a question about the EditLink component. I am trying to
> use it to edit an object of type gov.nasa.jpl.edrn.Participant. I have the
> following simple code snippet in my Trails application's Home.page:
>
> <p>
> <a href="#" jwcid="@trails:EditLink"
> model="ognl:page.persistenceService.getInstance(gov.nasa.jpl.edrn.Participa
> nt.class)" >Add a new Participant</a>
> </p>
>
> It's hard to find examples of how to use this EditLink component on the web.
> I need it though because I don't want to use the ListAllLink component (that
> trails uses by default), as I only want to shown certain objects (like the
> gov.nasa.jpl.edrn.Participant one) and allow users to add/edit them. By
> browsing around different examples, and the FishEye web repo, I thought
> maybe the above snippet would work, but it gives me an error (partial stack
> trace shown):
>
> org.apache.tapestry.BindingException: Unable to parse OGNL expression
> 'model': model [classpath:/org/trails/component/EditLink.jwc, line 9, column
> 30]
> at
> org.apache.tapestry.binding.ExpressionBinding.resolveExpression(ExpressionBi
> nding.java:145)
> at
> org.apache.tapestry.binding.ExpressionBinding.getObject(ExpressionBinding.ja
> va:125)
> at
> org.apache.tapestry.binding.AbstractBinding.getObject(AbstractBinding.java:8
> 4)
> at $ExternalLink_12.getParameters($ExternalLink_12.java)
> at
> org.apache.tapestry.link.ExternalLink.getLink(ExternalLink.java:40)
> at
> org.apache.tapestry.link.DefaultLinkRenderer.constructURL(DefaultLinkRendere
> r.java:120)
> at
> org.apache.tapestry.link.DefaultLinkRenderer.renderLink(DefaultLinkRenderer.
> java:68)
> at
> org.apache.tapestry.link.AbstractLinkComponent.renderComponent(AbstractLinkC
> omponent.java:94)
> at
> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:725)
>
>
> [..snip..]
>
> Caused by: org.apache.hivemind.ApplicationRuntimeException: Unable to parse
> OGNL expression 'model': model
> at
> org.apache.tapestry.services.impl.ExpressionCacheImpl.parse(ExpressionCacheI
> mpl.java:156)
> at
> org.apache.tapestry.services.impl.ExpressionCacheImpl.getCompiledExpression(
> ExpressionCacheImpl.java:115)
> at
> $ExpressionCache_1189177e273.getCompiledExpression($ExpressionCache_1189177e
> 273.java)
> at
> org.apache.tapestry.binding.ExpressionBinding.resolveExpression(ExpressionBi
> nding.java:134)
> ... 89 more
> Caused by: ognl.OgnlException: model [org.apache.tapestry.BindingException:
> Unable to parse OGNL expression
> 'page.persistenceService.getInstance(gov.nasa.jpl.edrn.Participant.class)':
> $HomePage_0.gov [context:/WEB-INF/Home.html, line 7]]
> at ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:1215)
> at
> ognl.ObjectPropertyAccessor.getPossibleProperty(ObjectPropertyAccessor.java:
> 60)
> at
> ognl.ObjectPropertyAccessor.getProperty(ObjectPropertyAccessor.java:144)
>
> [..snip..]
>
> As far as I can tell the TrailsPage component that all pages inherit from
> (I'm guessing the Home.page does too) provides the persistenceService, so I
> should be able to access it from ognl:, and as far as I can tell as well,
> the model="" parameter of the EditLink expects a java.lang.Object, which I'm
> guessing is the object to bring up an edit page for. The weirdest thing is,
> if I change my EditLink call above to:
>
> <a href="#" jwcid="@trails:EditLink" model="ognl:new
> gov.nasa.jpl.edrn.Participant()">Add a New Participant</a>
>
> The link renders on my Home.page, but when I click it, I get a null pointer
> exception message when it tries to take me to the EditPage. So I guess that
> Hibernate probably sets up some magic in the Participant object returned
> from persistenceService.getInstance that my regular old new Participant()
> call didn't do. So, I thought that calling it would fix the problem but it
> didn't. Can anyone help me?
>
> Thanks!
>
> Cheers,
> Chris
>
>
>
> ______________________________________________
> Chris Mattmann, Ph.D.
> Chris.Mattmann@...
> Cognizant Development Engineer
> Early Detection Research Network Project
> _________________________________________________
> Jet Propulsion Laboratory Pasadena, CA
> Office: 171-266B Mailstop: 171-246
> _______________________________________________________
>
> Disclaimer: The opinions presented within are my own and do not reflect
> those of either NASA, JPL, or the California Institute of Technology.
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe from this list, please visit:
>
> http://xircles.codehaus.org/manage_email
>
>
>
---------------------------------------------------------------------
To unsubscribe from this list, please visit:
http://xircles.codehaus.org/manage_email
The first error is due to the ognl expression This is how you
reference a class from ognl:
"ognl:@gov.nasa.jpl.edrn.Participant@class"
http://www.ognl.org/2.6.9/Documentation/html/LanguageGuide/staticMethods.html
You are right, the EditLink expects an hibernate entity so that code
won't work. You can try something like this
<a href="#" jwcid="@trails:EditLink"
model="ognl:page.persistenceService.getInstance(@gov.nasa.jpl.edrn.Participant@class,
1)" >
Edit Participant Nº 1
</a>
That should work, but I have never tried it.
I think that the NewLink component is what you are looking for.
Try with this:
<a class="newlink" href="#" jwcid="@trails:NewLink"
type="ognl:@gov.nasa.jpl.edrn.Participant@class">Add a New
Participant</a>
I know Trails lacks good documentation :( ,and I'm responsible for
that, so this mailing list is the best way to get some help.
Hope this helps.
Let me know how it goes.
Saludos.
Alejandro.
--
Alejandro Scandroli - http://weblog.amneris.es/
Amneris: We build process-driven web applications.
http://www.amneris.es
On Sun, Mar 9, 2008 at 4:04 AM, Chris Mattmann
<chris.mattmann@...> wrote:
> Hi Guys,
>
> How are ya? I have a question about the EditLink component. I am trying to
> use it to edit an object of type gov.nasa.jpl.edrn.Participant. I have the
> following simple code snippet in my Trails application's Home.page:
>
> <p>
> <a href="#" jwcid="@trails:EditLink"
> model="ognl:page.persistenceService.getInstance(gov.nasa.jpl.edrn.Participa
> nt.class)" >Add a new Participant</a>
> </p>
>
> It's hard to find examples of how to use this EditLink component on the web.
> I need it though because I don't want to use the ListAllLink component (that
> trails uses by default), as I only want to shown certain objects (like the
> gov.nasa.jpl.edrn.Participant one) and allow users to add/edit them. By
> browsing around different examples, and the FishEye web repo, I thought
> maybe the above snippet would work, but it gives me an error (partial stack
> trace shown):
>
> org.apache.tapestry.BindingException: Unable to parse OGNL expression
> 'model': model [classpath:/org/trails/component/EditLink.jwc, line 9, column
> 30]
> at
> org.apache.tapestry.binding.ExpressionBinding.resolveExpression(ExpressionBi
> nding.java:145)
> at
> org.apache.tapestry.binding.ExpressionBinding.getObject(ExpressionBinding.ja
> va:125)
> at
> org.apache.tapestry.binding.AbstractBinding.getObject(AbstractBinding.java:8
> 4)
> at $ExternalLink_12.getParameters($ExternalLink_12.java)
> at
> org.apache.tapestry.link.ExternalLink.getLink(ExternalLink.java:40)
> at
> org.apache.tapestry.link.DefaultLinkRenderer.constructURL(DefaultLinkRendere
> r.java:120)
> at
> org.apache.tapestry.link.DefaultLinkRenderer.renderLink(DefaultLinkRenderer.
> java:68)
> at
> org.apache.tapestry.link.AbstractLinkComponent.renderComponent(AbstractLinkC
> omponent.java:94)
> at
> org.apache.tapestry.AbstractComponent.render(AbstractComponent.java:725)
>
>
> [..snip..]
>
> Caused by: org.apache.hivemind.ApplicationRuntimeException: Unable to parse
> OGNL expression 'model': model
> at
> org.apache.tapestry.services.impl.ExpressionCacheImpl.parse(ExpressionCacheI
> mpl.java:156)
> at
> org.apache.tapestry.services.impl.ExpressionCacheImpl.getCompiledExpression(
> ExpressionCacheImpl.java:115)
> at
> $ExpressionCache_1189177e273.getCompiledExpression($ExpressionCache_1189177e
> 273.java)
> at
> org.apache.tapestry.binding.ExpressionBinding.resolveExpression(ExpressionBi
> nding.java:134)
> ... 89 more
> Caused by: ognl.OgnlException: model [org.apache.tapestry.BindingException:
> Unable to parse OGNL expression
> 'page.persistenceService.getInstance(gov.nasa.jpl.edrn.Participant.class)':
> $HomePage_0.gov [context:/WEB-INF/Home.html, line 7]]
> at ognl.OgnlRuntime.getMethodValue(OgnlRuntime.java:1215)
> at
> ognl.ObjectPropertyAccessor.getPossibleProperty(ObjectPropertyAccessor.java:
> 60)
> at
> ognl.ObjectPropertyAccessor.getProperty(ObjectPropertyAccessor.java:144)
>
> [..snip..]
>
> As far as I can tell the TrailsPage component that all pages inherit from
> (I'm guessing the Home.page does too) provides the persistenceService, so I
> should be able to access it from ognl:, and as far as I can tell as well,
> the model="" parameter of the EditLink expects a java.lang.Object, which I'm
> guessing is the object to bring up an edit page for. The weirdest thing is,
> if I change my EditLink call above to:
>
> <a href="#" jwcid="@trails:EditLink" model="ognl:new
> gov.nasa.jpl.edrn.Participant()">Add a New Participant</a>
>
> The link renders on my Home.page, but when I click it, I get a null pointer
> exception message when it tries to take me to the EditPage. So I guess that
> Hibernate probably sets up some magic in the Participant object returned
> from persistenceService.getInstance that my regular old new Participant()
> call didn't do. So, I thought that calling it would fix the problem but it
> didn't. Can anyone help me?
>
> Thanks!
>
> Cheers,
> Chris
>
>
>
> ______________________________________________
> Chris Mattmann, Ph.D.
> Chris.Mattmann@...
> Cognizant Development Engineer
> Early Detection Research Network Project
> _________________________________________________
> Jet Propulsion Laboratory Pasadena, CA
> Office: 171-266B Mailstop: 171-246
> _______________________________________________________
>
> Disclaimer: The opinions presented within are my own and do not reflect
> those of either NASA, JPL, or the California Institute of Technology.
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe from this list, please visit:
>
> http://xircles.codehaus.org/manage_email
>
>
>
---------------------------------------------------------------------
To unsubscribe from this list, please visit:
http://xircles.codehaus.org/manage_email
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