While upgrading my Artifactory server (free OSS version) from the version 5.2.0 to the latest 5.4.5, I was hit by an ARTIFACTORY_PID problem. After migrating from 5.3.2 to 5
Run this script:
/opt/jfrog/artifactory/bin/artifactoryManage.sh start
It will show the exact error to you.
In my case it was java version not updated. So I updated to java 1.8.