ArcGIS Server Java 9.3.1 Red Hat Linux 5 Custom SOEs throw errors when trying to start services having a custom SOE; the service does not start. The same custom SOE works fine on Windows.
This issue is not reproducible in the current release of the software. If you are encountering this issue, please contact Esri Technical Support (for customers in the United States) or your Esri distributor (for customers outside the United States) to resolve this issue.