I've been using PLJava for many years in a scientific application that I develop and distribute. The most recent version is running on Ubuntu Xenial running PG 9.5, and all has been well for quite some time.

On Wednesday my own instance of the server was shut down to replace a disk in a degraded raid array. When the server was restarted all aspects of my server seem to work fine with the exception of calls using PLJava which result in the following error message:

server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.

i've just had an email from another lab running my software who have the same problem. They noticed the problem following a power outage that shut their server down. So both servers first exhibited the issue following a hard restart. While there appear to have been no auto software updates done at time, I'm guessing now that a previous update may have been installed that didn't come into effect until the servers were rebooted?

Anybody have a similar problem? Any suggestions on how to troubleshoot?

Many thanks