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https://issues.apache.org/jira/browse/CXF-8578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17404345#comment-17404345
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Roland Elek commented on CXF-8578:
----------------------------------
[^cxf-8578-demo.tar.gz] is a demo project that illustrates the issue for more
clarity. It can be run as follows:
{noformat}
$ mvn package
$ java -jar target/cxf-8578-demo-1.0-SNAPSHOT.jar
{noformat}
> Bridge methods for covariant return types cannot be invoked on client proxies
> -----------------------------------------------------------------------------
>
> Key: CXF-8578
> URL: https://issues.apache.org/jira/browse/CXF-8578
> Project: CXF
> Issue Type: Bug
> Components: JAX-RS
> Affects Versions: 3.3.8, 3.5.0
> Reporter: Roland Elek
> Priority: Major
> Attachments: cxf-8578-demo.tar.gz
>
>
> For a method override using covariant return types, the Java compiler
> generates a bridge method that has the same name and parameter types as the
> real one. If a resource class has such an override, and inherits JAX-RS
> annotations from an interface it implements, the two methods will correspond
> to the same annotated method.
> Because of this, as implemented in CXF-7670, the real method is mapped to the
> operation defined by the annotations, while the bridge method is ignored.
> This causes a javax.ws.rs.ProcessingException when trying to invoke it on
> client proxies built from the concrete class. This kind of invocation happens
> when the proxy is upcast.
> I already have a fix for this on top of CXF 3.3.8. The pull request is in
> progress.
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