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https://issues.apache.org/jira/browse/CXF-6694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034628#comment-15034628
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Sergey Beryozkin commented on CXF-6694:
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I've thought a bit more about it, see this factory is really useful if 
prototype or per-request scope beans need to be supported, it does not add 
anything really if it is a singleton (well, a minor simplification in that one 
can use bean id attributes only instead of declaring jaxrs:serviceBeans).

So if you have a singleton, then why don't refer to such a singleton from 
jaxrs:serviceBeans directly ?.  

> SpringResourceFactory does not work with constructor-autowired beans
> --------------------------------------------------------------------
>
>                 Key: CXF-6694
>                 URL: https://issues.apache.org/jira/browse/CXF-6694
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-RS
>    Affects Versions: 3.1.4
>            Reporter: Vladimir Kulev
>              Labels: spring
>
> When used with constructor-autowired bean, it fails with "Resource class ... 
> has no valid constructor" exception. We don't need constructor at all when we 
> already have a singleton instance from Spring.
> Also it looks like {{isSingleton()}} is called for the first time before 
> correct value is calculated a few lines below: {{isSingleton = 
> ac.isSingleton(beanId)}}



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