Should not run if the Java runtime is below the minimum version

[GinoCanessa]

In Publisher.java:

• the Java version is displayed
• there are other checks for minimum configuration

Given that the publisher now requires at least Java 11, it would be good to add a check on the major java version and exit if the requirements are not met.

Thanks!

[grahamegrieve]

but you won't get to that code if it's not java 11

[GinoCanessa]

Ah, my bad. Thought people were discussing issues with running under Java 8 and getting exceptions during processing.