Good find! I’d say create a jira on making solrj client side work with apache 
client excluded. Makes sense.

Jan Høydahl

> 28. mar. 2023 kl. 07:04 skrev Shawn Heisey <apa...@elyograg.org>:
> 
> I have some simple solrj code pulling in solrj 9.2.0 that creates a client 
> (Http2SolrClient) and then uses that to send a collection creation request.  
> I know, I should probably use a Cloud client, but I'm emulating a customer 
> setup where they are on SolrJ 4.7.0 and using HttpSolrServer.
> 
> In order to trim down the ultimate size of my sandbox app, I theorized that 
> Http2SolrClient was not using the Apache httpclient, so I excluded all the 
> org.apache.httpcomponents artifacts.
> 
> My simple code failed, because Http2SolrClient is using 
> org.apache.http.entity.ContentType from the Apache client.
> 
> The usage can be found in branch_9_2 Http2SolrClient.java on line 823.
> 
> I couldn't figure out a way to do that with the Jetty client, but I admit I 
> didn't try much beyond seeing if there was an alternate version of the 
> ContentType class.  The usage is in a lambda, and I don't understand lambdas 
> very well.
> 
> How much of a mess is it going to be to remove that last Apache httpclient 
> usage?
> 
> There are a lot of other usages from httpcomponents across the main Solr 
> codebase.  I think it might be a worthwhile project to convert those, to use 
> classes included with Java whenever possible, and resort to Jetty or another 
> already-present dependency where absolutely required.
> 
> I wonder if it might be worthwhile to create an abstract class in Solr for 
> http clients, and have descendants of that class which implement 
> functionality using jetty and apache clients.  If that is pursued, that work 
> should probably be limited to main until it is stable.  If we do that and do 
> it right, then we would be free to swap out the http client implementation at 
> any time, if we find something that works better than either Jetty or Apache.
> 
> Thanks,
> Shawn
> 
> 
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