You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@tapestry.apache.org by le...@bredband.net on 2007/03/23 16:03:47 UTC
"No engine service is available" problem
I' trying to convert an old, pre 3.0 tapestry application to T4.1. Although it's quite some work, most of it goes smoothly. However, I have an external service called "Pdf", and it doesn't work at all. Basically, when I'm trying to render a page containing a link to the service I get the message "No engine service named '<SingletonProxy for net.kolmodin.yalt.Pdf(org.apache.tapestry.engine.IEngineService)>' is available. This has now taken a looong time, and I'm just stuck :-(
Some bits out of this: The component being rendered:
<component id="pdfLink" type="ServiceLink">
<binding name="service" value="hivemind:service:net.kolmodin.yalt.Pdf" />
<binding name="title" value="message:pdfTip"/>
<binding name="parameters" value="ognl:page.layoutId" />
</component>
hivemodule.xml:
<contribution configuration-id="tapestry.services.ApplicationServices">
<service name="pdf" object="service:Pdf"/>
</contribution>
<service-point id="Pdf"
interface="org.apache.tapestry.engine.IEngineService">
<invoke-factory>
<construct class="net.kolmodin.yalt.list.PdfFormatService">
<set-object property="response" value="tapestry.globals.response"/>
<set-object property="request" value="tapestry.globals.request"/>
<set-object property="linkFactory" value="infrastructure:linkFactory"/>
</construct>
</invoke-factory>
The service is a little too big for this message. It's getName() returns 'pdf', though, and it does implement IEngineService according to the compiler. I have inserted log statements in the getLink method, but it obviously crashes before this call.
One possible problem is that the service is a concrete class called PdfFormatService, inheriting a lot of properties from the abstract FormatService. Are there any limitations in such a scenario in the hivemind reflection code?
A grep in the log (which logs all DEBUG messages) shows that the missing SingletonProxy has been created.
2007-03-23 15:19:12,332 [main] DEBUG org.apache.hivemind.impl.RegistryBuilder - Creating service point net.kolmodin.yalt.Pdf
2007-03-23 15:19:12,332 [main] DEBUG org.apache.hivemind.impl.RegistryBuilder - Adding InvokeFactoryDescriptor[factoryServiceId=hivemind.BuilderFactory parameters=[ElementImpl[elementName=construct attributes=[AttributeImpl[name=class value=net.kolmodin.yalt.list.PdfFormatService]] elements=null content=]] serviceModel=singleton] to service extension point net.kolmodin.yalt.Pdf
2007-03-23 15:19:12,332 [main] DEBUG org.apache.hivemind.impl.RegistryBuilder - Adding InterceptorDescriptor[factoryServiceId=hivemind.LoggingInterceptor parameters=null before=null after=null name=null] to service extension point net.kolmodin.yalt.Pdf
2007-03-23 15:19:18,078 [http-8080-Processor25] DEBUG net.kolmodin.yalt.Pdf - Creating SingletonProxy for service net.kolmodin.yalt.Pdf
2007-03-23 15:19:35,732 [http-8080-Processor25] DEBUG org.apache.tapestry.engine.RequestCycle - Set attribute org.apache.tapestry.active-link-component to $ServiceLink_89@a4018541[MemberList/pdfLink]
org.apache.hivemind.ApplicationRuntimeException: No engine service named '<SingletonProxy for net.kolmodin.yalt.Pdf(org.apache.tapestry.engine.IEngineService)>' is available.
~
~
~
The top of the stack trace:
#org.apache.tapestry.services.impl.ServiceMapImpl.buildProxy(ServiceMapImpl.java:143)
#org.apache.tapestry.services.impl.ServiceMapImpl.getService(ServiceMapImpl.java:105)
#$ServiceMap_1117f2a5533.getService($ServiceMap_1117f2a5533.java)
#org.apache.tapestry.link.ServiceLink.getLink(ServiceLink.java:38)
Any hints out there?
--Alec
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
For additional commands, e-mail: users-help@tapestry.apache.org
Re: "No engine service is available" problem
Posted by Jesse Kuhnert <jk...@gmail.com>.
Trying giving it the binding :
<binding name="service" value="literal:pdf" />
instead. (the literal should be the service name of your service as it
is defined in your hivemind configuration contribution )
On 3/23/07, leamas@bredband.net <le...@bredband.net> wrote:
> I' trying to convert an old, pre 3.0 tapestry application to T4.1. Although it's quite some work, most of it goes smoothly. However, I have an external service called "Pdf", and it doesn't work at all. Basically, when I'm trying to render a page containing a link to the service I get the message "No engine service named '<SingletonProxy for net.kolmodin.yalt.Pdf(org.apache.tapestry.engine.IEngineService)>' is available. This has now taken a looong time, and I'm just stuck :-(
>
> Some bits out of this: The component being rendered:
>
> <component id="pdfLink" type="ServiceLink">
> <binding name="service" value="hivemind:service:net.kolmodin.yalt.Pdf" />
> <binding name="title" value="message:pdfTip"/>
> <binding name="parameters" value="ognl:page.layoutId" />
> </component>
>
> hivemodule.xml:
>
> <contribution configuration-id="tapestry.services.ApplicationServices">
> <service name="pdf" object="service:Pdf"/>
> </contribution>
>
> <service-point id="Pdf"
> interface="org.apache.tapestry.engine.IEngineService">
> <invoke-factory>
> <construct class="net.kolmodin.yalt.list.PdfFormatService">
> <set-object property="response" value="tapestry.globals.response"/>
> <set-object property="request" value="tapestry.globals.request"/>
> <set-object property="linkFactory" value="infrastructure:linkFactory"/>
> </construct>
> </invoke-factory>
>
>
> The service is a little too big for this message. It's getName() returns 'pdf', though, and it does implement IEngineService according to the compiler. I have inserted log statements in the getLink method, but it obviously crashes before this call.
>
> One possible problem is that the service is a concrete class called PdfFormatService, inheriting a lot of properties from the abstract FormatService. Are there any limitations in such a scenario in the hivemind reflection code?
>
> A grep in the log (which logs all DEBUG messages) shows that the missing SingletonProxy has been created.
>
> 2007-03-23 15:19:12,332 [main] DEBUG org.apache.hivemind.impl.RegistryBuilder - Creating service point net.kolmodin.yalt.Pdf
> 2007-03-23 15:19:12,332 [main] DEBUG org.apache.hivemind.impl.RegistryBuilder - Adding InvokeFactoryDescriptor[factoryServiceId=hivemind.BuilderFactory parameters=[ElementImpl[elementName=construct attributes=[AttributeImpl[name=class value=net.kolmodin.yalt.list.PdfFormatService]] elements=null content=]] serviceModel=singleton] to service extension point net.kolmodin.yalt.Pdf
> 2007-03-23 15:19:12,332 [main] DEBUG org.apache.hivemind.impl.RegistryBuilder - Adding InterceptorDescriptor[factoryServiceId=hivemind.LoggingInterceptor parameters=null before=null after=null name=null] to service extension point net.kolmodin.yalt.Pdf
> 2007-03-23 15:19:18,078 [http-8080-Processor25] DEBUG net.kolmodin.yalt.Pdf - Creating SingletonProxy for service net.kolmodin.yalt.Pdf
> 2007-03-23 15:19:35,732 [http-8080-Processor25] DEBUG org.apache.tapestry.engine.RequestCycle - Set attribute org.apache.tapestry.active-link-component to $ServiceLink_89@a4018541[MemberList/pdfLink]
> org.apache.hivemind.ApplicationRuntimeException: No engine service named '<SingletonProxy for net.kolmodin.yalt.Pdf(org.apache.tapestry.engine.IEngineService)>' is available.
> ~
> ~
> ~
>
> The top of the stack trace:
> #org.apache.tapestry.services.impl.ServiceMapImpl.buildProxy(ServiceMapImpl.java:143)
> #org.apache.tapestry.services.impl.ServiceMapImpl.getService(ServiceMapImpl.java:105)
> #$ServiceMap_1117f2a5533.getService($ServiceMap_1117f2a5533.java)
> #org.apache.tapestry.link.ServiceLink.getLink(ServiceLink.java:38)
>
> Any hints out there?
>
> --Alec
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
> For additional commands, e-mail: users-help@tapestry.apache.org
>
>
--
Jesse Kuhnert
Tapestry/Dojo team member/developer
Open source based consulting work centered around
dojo/tapestry/tacos/hivemind. http://blog.opencomponentry.com
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tapestry.apache.org
For additional commands, e-mail: users-help@tapestry.apache.org