You installed Symantec Scan Engine (SSE) 5.2.x / Symantec Protection Engine (SPE) 7.0.x on a Linux host. Later, when you update the server-side Java Runtime Environment (JRE), you cannot start symcscan any longer.
SSE/SPE does not automatically recognize the new path to updated JRE.
Best practice for the initial installation is to always install JRE first. However, if you need to update JRE after SSE/SPE installation, manually update the JRE path information, which is referred by SSE/SPE.