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https://issues.apache.org/jira/browse/SOLR-17032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17950544#comment-17950544
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Jason Gerlowski commented on SOLR-17032:
----------------------------------------

I've spent bits of time poking at this on and off, and haven't managed to 
figure it out.  I'm sure it's fixable - it's just never been high enough 
priority for me personally to devote quite as much time as it needs.

A workaround in the interim would be a log4j config change to set the log level 
for the involved logger to "ERROR".

> Jersey MessagingBinders class logs "A class javax.activation.DataSource for a 
> default provider MessageBodyWriter<javax.activation.DataSource> was not 
> found" warning on startup
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-17032
>                 URL: https://issues.apache.org/jira/browse/SOLR-17032
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 9.4
>            Reporter: Shawn Heisey
>            Priority: Minor
>              Labels: startup
>
> Solr 9.4.0 on both Linux and Windows log the following:
> {code:java}
> 2023-10-16 13:07:54.191 WARN  (main) [] o.g.j.m.i.MessagingBinders A class 
> javax.activation.DataSource for a default provider 
> MessageBodyWriter<javax.activation.DataSource> was not found. The provider is 
> not available.
> {code}
> Research turns up that getting rid of this warning requires adding 
> {{jakarta.activation/jakarta.activation-api}} to dependencies.
> Have not been able to determine whether this is actually a problem or just a 
> harmless log entry.



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