Hi Craig, It sounds like this might be the https://issues.apache.org/jira/browse/SOLR-17268 issue.
Hope that helps. -Christine From: [email protected] At: 07/15/26 21:35:44 UTC+1:00To: [email protected] Cc: [email protected] Subject: arrntv namedListStyle must only be used with ArrayOfNameTypeValueJSONWriter We are upgrading several Solr instances from 9.2.1 to 9.10.1 (updating the software and tweaking parameters in the invocation script, but leaving the data the same for now) Two of the collections are not allowing me to select, complaining { "error":{ "msg":"arrntv namedListStyle must only be used with ArrayOfNameTypeValueJSONWriter", "trace":"java.lang.UnsupportedOperationException: arrntv namedListStyle must only be used with ArrayOfNameTypeValueJSONWriter\n\tat org.apache.solr.common.util.JsonTextWriter.writeNamedList(JsonTextWriter.java:32 2)\n\tat... ... "code":500 } I notice that the select requestHandler in solrconfig.xml for these two collections do have <str name="json.nl">arrntv</str> But there are seven other collections in the same SolrCloud which also have this same line in the select requestHandler in their solrconfig.xml; and they have no problem running select; I have not yet been able to determine what might make the difference that is special about these two collections out of the nine collections I plan to continue trial and error; but if anyone has a suggestion, please advise Thanks
