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From Gonçalo Marques (JIRA) <>
Subject [jira] [Comment Edited] (OPENEJB-2125) CDI extension that wraps an InjectionTarget (JAX-RS) causes a ClassCastException
Date Tue, 05 Jan 2016 00:28:39 GMT


Gonçalo Marques edited comment on OPENEJB-2125 at 1/5/16 12:28 AM:

Attach sample project

was (Author: gonmarques):
Issue reproduction

> CDI extension that wraps an InjectionTarget (JAX-RS) causes a ClassCastException
> --------------------------------------------------------------------------------
>                 Key: OPENEJB-2125
>                 URL:
>             Project: OpenEJB
>          Issue Type: Bug
>          Components: integration, tomee
>    Affects Versions: (not version related)
>            Reporter: Gonçalo Marques
>         Attachments:
> 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 {{ Class<?>
> 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|].
The specific CDI extension class may also be found at GitHub [com.byteslounge.cdi.extension.PropertyExtension|].
> 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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