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The "HackingSolr" page has been changed by HossMan: http://wiki.apache.org/solr/HackingSolr?action=diff&rev1=14&rev2=15 Comment: trunk->4x The Solr website contains [[http://lucene.apache.org/solr/version_control.html|Information about the Lucene/Solr Source Code SVN Repository]] - There are currently two active development branches: "branches/branch_3x/" which all 3.x releases are derived from, and "trunk" which will be [[Solr4.0]]. There are [[NightlyBuilds|nightly builds]] for both. + There are currently two active development branches: "branches/branch_4x/" which all 4.x releases are derived from, and "trunk" which will be [[Solr5.0]]. There are [[NightlyBuilds|nightly builds]] for both. = Hacking With Solr = == Solr Plugins == The first thing to know if you are interested in hacking and customizing Solr, is that you may not need to customize the source at all. Solr has a fairly extensive number of [[SolrPlugins|Plugin Hooks]] that allow you to add custom functionality for a variety of purposes by developing against some simple APIs, and then use your plugins by placing your jar in a special "lib" directory and referring to them by name in your configuration file. + + == Customizing the War == <!> [[Solr3.4]] Note that the ant build.xml files changed in Solr 3.4+, so these instructions would need to be altered for earlier versions.