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https://issues.apache.org/jira/browse/CXF-7146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Beryozkin resolved CXF-7146.
-----------------------------------
Resolution: Duplicate
> Support void return types when using the async proxy-based client API
> ---------------------------------------------------------------------
>
> Key: CXF-7146
> URL: https://issues.apache.org/jira/browse/CXF-7146
> Project: CXF
> Issue Type: Bug
> Components: JAX-RS
> Reporter: John Poth
>
> It is currently impossible to register a generic _InvocationCallback<Object>_
> when invoking a method that returns void. This is due to a
> [check|https://github.com/apache/cxf/blob/master/rt/rs/client/src/main/java/org/apache/cxf/jaxrs/client/ClientProxyImpl.java#L797]
> that isn't satisfied when the _methodReturnType_ is void. I propose to add
> the following case
> {code}
> Object.class == callbackRespClass
> {code}
> And let the user handle the logic.
> I also propose to remove the condition
> {code}
> Response.class == callbackRespClass
> {code}
> Which will lead to failure when
> [casting|https://github.com/apache/cxf/blob/master/rt/rs/client/src/main/java/org/apache/cxf/jaxrs/client/JaxrsClientCallback.java#L76]
> to a return type upon completion. I will provide a PR.
> [~sergey_beryozkin] sorry for the confusion.
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