Hi Bram, i don't report any build failure in ant fresh_install, maybe you have a preinstalled and full lucene search (with many documents) and you trying to fresh_install? Another tip could be to run before a mvn clean package (please take a look at [dspace-source]/dspace/target/dspace-[version]-build/lib directory which version of lucene running). BTW i try to investigate in deep. Thank you.