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https://issues.apache.org/jira/browse/TAPESTRY-2517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630044#action_12630044
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Howard M. Lewis Ship commented on TAPESTRY-2517:
------------------------------------------------
To reproduce this, visit a page with an invalid injection. You get an
appropriate error. A refresh of the page (a new request for the page) results
in the second error (the one involving non-private fields).
I believe that what's happening is that the *partially* transformed class is
"hanging around". A refresh of the page attempts to restart the
transformation, but see some of the work Tapestry did on the previous request.
> A failed service injection into a component field is visible in the browser
> as a spurious error about field _$resources
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: TAPESTRY-2517
> URL: https://issues.apache.org/jira/browse/TAPESTRY-2517
> Project: Tapestry
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.0.13
> Reporter: Howard M. Lewis Ship
> Priority: Critical
>
> The error was that I was injecting a service but hadn't bound it in my
> AppModule. Scanning down the console, I found the exception:
> Caused by: java.lang.RuntimeException: Error obtaining injected value for
> field com.formos.blog.pages.blog.BlogIndex.blogDAO: No service implements the
> interface com.formos.blog.services.BlogDAO.
> at
> org.apache.tapestry5.internal.transform.InjectWorker.transform(InjectWorker.java:68)
> at
> $ComponentClassTransformWorker_11b13c8fa72.transform($ComponentClassTransformWorker_11b13c8fa72.java)
> at
> $ComponentClassTransformWorker_11b13c8fa68.transform($ComponentClassTransformWorker_11b13c8fa68.java)
> at
> org.apache.tapestry5.internal.services.ComponentClassTransformerImpl.transformComponentClass(ComponentClassTransformerImpl.java:161)
> ... 98 more
> Caused by: java.lang.RuntimeException: No service implements the interface
> com.formos.blog.services.BlogDAO.
> at
> org.apache.tapestry5.ioc.internal.RegistryImpl.getService(RegistryImpl.java:523)
> at
> org.apache.tapestry5.ioc.internal.ObjectLocatorImpl.getService(ObjectLocatorImpl.java:44)
> at
> org.apache.tapestry5.internal.services.ServiceInjectionProvider.provideInjection(ServiceInjectionProvider.java:40)
> at
> $InjectionProvider_11b13c8fa74.provideInjection($InjectionProvider_11b13c8fa74.java)
> at
> $InjectionProvider_11b13c8fa6d.provideInjection($InjectionProvider_11b13c8fa6d.java)
> at
> org.apache.tapestry5.internal.transform.InjectWorker.transform(InjectWorker.java:57)
> However, the exception in the web browser was:
> java.lang.RuntimeException
> Class com.formos.blog.pages.blog.BlogIndex contains field(s) (_$resources)
> that are not private. You should change these fields to private, and add
> accessor methods if needed.
> Stack trace
> *
> org.apache.tapestry5.internal.services.InternalClassTransformationImpl.verifyFields(InternalClassTransformationImpl.java:294)
> *
> org.apache.tapestry5.internal.services.InternalClassTransformationImpl.preloadMemberNames(InternalClassTransformationImpl.java:256)
> *
> org.apache.tapestry5.internal.services.InternalClassTransformationImpl.<init>(InternalClassTransformationImpl.java:151)
> *
> org.apache.tapestry5.internal.services.ComponentClassTransformerImpl.transformComponentClass(ComponentClassTransformerImpl.java:154)
> *
> org.apache.tapestry5.internal.services.ComponentInstantiatorSourceImpl.onLoad(ComponentInstantiatorSourceImpl.java:182)
> * javassist.Loader.findClass(Loader.java:340)
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