Apache Clerezza TDB Launcher The provided launcher jar is executable, however on most platform you must provide additional arguments to java so that Clerezza has enough memory to run. Start clerezza with: java -XX:MaxPermSize=400m -Dfile.encoding=utf-8 -Xss512k -Xmx2g -jar platform.launcher.tdb-*.jar Add the --help at the end of the line above to see possible argument for Clerezza