You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@tomee.apache.org by "Gonçalo Marques (JIRA)" <ji...@apache.org> on 2016/01/05 01:18:39 UTC
[jira] [Created] (OPENEJB-2125) CDI extension that wraps an
InjectionTarget (JAX-RS) causes a ClassCastException
Gonçalo Marques created OPENEJB-2125:
----------------------------------------
Summary: 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
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
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)