Looking to get more visibility on backwards compatibility for SolrJ: https://issues.apache.org/jira/browse/SOLR-17518?focusedCommentId=17935379&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17935379
Up until but not including SolrJ 9.9 (not released yet), a user could create a new RequestWriter() to write a request to Solr in XML (HTTP POST). In general users don't specify this; the default is "javabin", which is much more efficient. The change in 9.9 is that new RequestWriter() won't work at all, as it's abstract; new XMLRequestWriter() should be used. Of course it ought to have been this way all along; better late than never. Is compatibility here something we care to uphold? I tend to think so because it's a major component. A simple revert and adding a dummy subclass called XMLRequestWriter would be compatible and an onramp to compatibility with SolrJ 10. ~ David Smiley Apache Lucene/Solr Search Developer http://www.linkedin.com/in/davidwsmiley
