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https://issues.apache.org/jira/browse/OPENEJB-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gonçalo Marques updated OPENEJB-2125:
-------------------------------------
Attachment: test-app.zip
Issue reproduction
> CDI extension that wraps an InjectionTarget (JAX-RS) causes a
> ClassCastException
> --------------------------------------------------------------------------------
>
> Key: OPENEJB-2125
> URL: https://issues.apache.org/jira/browse/OPENEJB-2125
> Project: OpenEJB
> Issue Type: Bug
> Components: integration, tomee
> Affects Versions: (not version related)
> Reporter: Gonçalo Marques
> Attachments: test-app.zip
>
>
> If an arbitrary CDI extension wraps a {{InjectionTarget}} during {{@Observes
> ProcessInjectionTarget<T>}} event, it will result in a {{ClassCastException}}
> in TomEE JAX-RS service startup.
> *Example*
> {code:borderStyle=solid}
> // InjectionTarget wrapper
> public class InjectionTargetWrapper<T> implements InjectionTarget<T>
> {
> private final InjectionTarget<T> wrapped;
>
> public InjectionTargetWrapper(InjectionTarget<T> injectionTarget){
> this.wrapped = injectionTarget;
> }
> // All InjectionTarget interface methods
> // delegate to the wrapped instance and
> // decorate the wrapped instance
> // implementation where needed
> }
> // CDI extension
> public class SomeExtension implements Extension {
> <T> void processInjectionTarget(@Observes ProcessInjectionTarget<T> pit,
> BeanManager beanManager) {
> InjectionTarget<T> it = pit.getInjectionTarget();
> pit.setInjectionTarget(new InjectionTargetWrapper<T>(it);
> }
> }
> {code}
> With the aforementioned wrapping, any existing CDI managed JAX-RS endpoint
> that is processed by the CDI extension will have its {{InjectionTarget}}
> changed to the wrapper type: {{InjectionTargetWrapper}}.
> This results in a {{ClassCastException}} during TomEE JAX-RS service startup,
> more precisely in
> {{org.apache.openejb.server.cxf.rs.CdiResourceProvider#findContexts(final
> Class<?> clazz)}}.
> This method will be called by the CXF application deployment while processing
> the JAX-RS endpoint bean and will cast the bean {{InjectionTarget}} to
> {{InjectionTargetImpl}}. Since the JAX-RS bean {{InjectionTarget}} has been
> changed to the wrapper - of type {{InjectionTargetWrapper}} - this results in
> a {{ClassCastException}}.
> This has been originally reported [at
> GitHub|https://github.com/gonmarques/cdi-properties/issues/2]. The specific
> CDI extension class may also be found at GitHub
> [com.byteslounge.cdi.extension.PropertyExtension|https://github.com/gonmarques/cdi-properties/blob/master/cdi-properties-main/src/main/java/com/byteslounge/cdi/extension/PropertyExtension.java].
> While the just mentioned extension is more complex than the initial example
> described in this issue, this problem will occur for every CDI extension that
> happens to process and change a JAX-RS endpoint {{InjectionTarget}} to
> another type, ex: a wrapper (if the wrapper itself does not inherit from
> OpenWebBeans {{InjectionTargetImpl}} of course, but this is not likely to
> happen for the obvious reasons).
> I will attach a very simple ready-to-build project that demonstrates the
> issue. The project has a JAX-RS endpoint and includes the aforementioned CDI
> extension. The problem will immediately occur if the application is deployed
> in TomEE JAX-RS v1.7.3
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