The BDB JE library is required to use this optional module. The jar file may be downloaded by either: Seperately running the following command from the qpid/java/bdbstore dir: ant download-bdb OR Adding -Ddownload-bdb=true to your regular build command. The BDB JE library was not found *NOTE* The BDB JE library required by this optional module is licensed under the Sleepycat Licence, which is not compatible with the Apache Licence v2.0. For a copy of the Sleepycat Licence, please see: http://www.oracle.com/technetwork/database/berkeleydb/downloads/jeoslicense-086837.html