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 [EMAIL PROTECTED]/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
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