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https://issues.apache.org/jira/browse/MYFACES-4643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17789200#comment-17789200
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Thomas Andraschko commented on MYFACES-4643:
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no, its not per definition incompatible.
OmniFaces could just add a "bean defining annotation" to it (check CDI spec) or 
omnifaces / your application must set bean-discovery-mode=all. Anyway, its just 
a CDI problem or configuration, we cant help here.

If you set org.apache.myfaces.annotation.USE_CDI_FOR_ANNOTATION_SCANNING=false, 
MyFaces has to manually open all JARs in the WAR and scan for `@FacesConverter` 
and that should >actually work<
TBH i wont invest many time here. MF5.0 will rely on CDI scanning only. i would 
try to fix your setup here or ask OmniFaces guys to add e.g. @ApplicationScoped.



> OmniFaces converters not found using CDI
> ----------------------------------------
>
>                 Key: MYFACES-4643
>                 URL: https://issues.apache.org/jira/browse/MYFACES-4643
>             Project: MyFaces Core
>          Issue Type: Bug
>          Components: General
>    Affects Versions: 4.0.1
>            Reporter: Manuel K
>            Priority: Major
>         Attachments: primefaces-test.zip
>
>
> [As I wrote in the OmniFaces GitHub 
> repository|https://github.com/omnifaces/omnifaces/issues/744#issuecomment-1824172540]:
> When upgrading from OmniFaces 4.1 to 4.2/4.3 in our application (WildFly 30, 
> MyFaces 4.0.1), we get the following errors due to the change to the 
> _bean-discovery-mode_ discussed in the linked GitHub issue:
> {code:java}
> jakarta.faces.FacesException: Could not find any registered converter-class 
> by converterId : omnifaces.SelectItemsConverter {code}
> It especially happens when using the following context-param:
> {code:java}
> <context-param>
>     
> <param-name>org.apache.myfaces.annotation.USE_CDI_FOR_ANNOTATION_SCANNING</param-name>
>     <param-value>true</param-value>
> </context-param> {code}
> But in our application it even happens without it. Reproducer using 
> primefaces-test is attached. Run it using _mvn clean jetty:run -Pmyfaces40_ 
> and the exception appears.
> I would have thought that it would be an OmniFaces issue, but melloware 
> thinks it's a MyFaces issue.
>  



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