For future reference: Solved my problem by simply contributing my
enhancement worker with before="tapestry.enhance.inject-specification"
instead of before="tapestry.enhance.abstract-property"!
> --- Ursprüngliche Nachricht ---
> Von: "Mark Lehmacher" <[EMAIL PROTECTED]>
> An: tapestry-user@jakarta.apache.org
> Betreff: using EnhancementWorkers for Specification Inheritance
> Datum: Tue, 4 Apr 2006 12:59:36 +0200
>
> Hello,
>
> I am using JDK1.4 and for that reason can not use the annotations.
> However,
> I would still like be able to provide for "specification inheritance",
> i.e.
> getting my ASO injected to all classes which derive from my BasePage
> without
> having to specify an inject declaration in each of my page xml specs. I
> thought I could do that by using EnhancementWorkers but I still end up
> getting a NPE when accessing my allegedly inserted ASO. My
> EnhancementWorker impl looks as follows:
>
> public void performEnhancement(EnhancementOperation op,
> IComponentSpecification spec) {
>
> if (op.implementsInterface(BasePage.class)) {
>
> // xml fragment: <inject property="aso" type="state"
> object="aso"/>
>
> InjectSpecification asoInjSpec = new
> InjectSpecificationImpl();
> asoInjSpec.setType("state");
> asoInjSpec.setProperty("aso");
> asoInjSpec.setObject("aso");
>
> spec.addInjectSpecification (asoInjSpec);
> }
> }
>
>
>
> where BasePage.class is the class of the base page for all my pages. My
> hivemind contribution looks as follows:
>
> <contribution configuration-id="tapestry.enhance.EnhancementWorkers">
> <command id="enhance-basePage-worker"
> object="service:BasePageEnhancementWorker"
> before="tapestry.enhance.abstract-property" />
> </contribution>
>
> <service-point id="BasePageEnhancementWorker"
> interface="org.apache.tapestry.enhance.EnhancementWorker">
> <invoke-factory>
> <construct
> class="mailadm.web.enhance.BasePageEnhancementWorker">
> </construct>
> </invoke-factory>
> </service-point>
>
> When I add debug statements to my EnhancementWorker I see it gets executed
> just fine. Moreover I added debug statements to
> org.apache.tapestry.enhance.InjectStateWorker and it works on my aso
> inject
> spec. However, the funny thing is that when using a state inject spec from
> my xml page spec, the InjectStateWorker logs two invocations for one
> injection, whereas for my EnhancementWorker only one invocation is logged
> and I end up with a non-working injection (i.e. the NPE when trying to
> access the injected property).
>
> Any help would be greatly appreciated. Thanks!
>
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