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https://issues.apache.org/jira/browse/SOLR-8266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044899#comment-15044899
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Dennis Gove commented on SOLR-8266:
-----------------------------------

While that mapping is setup in the test you've got to remember that in a 
parallel situation the expression is passed off to a different process ehoch 
doesn't use the factory created in the test. Instead it uses a factory created 
in StreamHandler. That one has some defaults set and also reads solrconfig.xml 
to get any new mappings. Check that factory to make sure count is mapped there. 
I've tried to keep the default up to date with all default stream classes but 
may have missed some. 

> Remove Java Serialization from the Streaming API
> ------------------------------------------------
>
>                 Key: SOLR-8266
>                 URL: https://issues.apache.org/jira/browse/SOLR-8266
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Joel Bernstein
>         Attachments: SOLR-8266.patch
>
>
> This is being done mainly for security reasons but it's also architecturally 
> the right thing to do.
> Going forward only Streaming Expressions will be used to serialize Streaming 
> API Objects. 



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