I had to migrate from Java7 to Java8 eventually.
When you start launching your jenkins WAR file, you will run into at least these issues:
- for HTTPS you are requested to create a certificate
- “-Djava.awt.headless=…”
- font trouble
In order to ignore the HTTPS / certificate noise for the time being, I switched on the HTTP port again, and I switched off the HTTPS port.
I decided to give “my own” Java (from Oracle downloads) a try. I downloaded “my own” “Java SE 8u192” for Linux x64 from Oracle downloads, untarred, and made use of it within my start-up script.
The “-Djava.awt.headless=…” and the font trouble simply disappeared after that.
The certificate issue:
Just do, as you get told!
This is my experience gathered on my Synology DS713+.