https://community.appian.com/discussions/f/general/14715/appian-engines-dont-start-after-appian-upgrade-to-18-4Hi all, We see the below error after upgrading to appian 18.4 [bpm@blbbpmsappt01 bin]$ ./start.sh -p appian -s all Starting Distributed Transaction Log Executing command: &#39;[null/bin/java, -Xms128m, -Xmx256m, -Dzookeeper.log.dir=/appdata/appian/logsen-USTelligent Community 12https://community.appian.com/thread/67166?ContentTypeID=1Mon, 10 Jun 2019 10:10:03 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:5deb5c2d-7b09-4966-9dd9-94f19d541493Sathya Srinivasan<p>Can you check if you are using export JAVA_HOME - ....</p> <p>I had the same issue when I just said JAVA_HOME in my .bashrc but changing it to export JAVA_HOME solved the problem</p><div style="clear:both;"></div>