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The "HowToContribute" page has been changed by ErickErickson: http://wiki.apache.org/solr/HowToContribute?action=diff&rev1=77&rev2=78 Comment: Added note about MVN tests failing. '''YOU PROBABLY DON'T HAVE TO DO THIS''' but if you do for some reason want to regenerate the .java from the .jflex files, here's the cheat-sheet. This is a separate step that people who actually ''like'' parsers sometimes have to execute to reflect changes in various grammars. * Check out the most recent jflex branch. This is important since what Lucene uses is based on trunk rather than a released version (thanks for tutoring me Uwe!). Do this by executing: svn co https://jflex.svn.sourceforge.net/svnroot/jflex/trunk jflex * cd jflex - * mvn install + * mvn install (NOTE: I've seen the tests fail in this step, doesn't seem to matter) * cd <solr_home>/lucene/analysis/common * export ANT_OPTS="-Xmx1G -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=1G" (1) * ant jflex