[cross-project-issues-dev] Attention: latest Jenkins LTS requires JDK11

[Frederic Gurr <frederic.gurr@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

Please be aware that the latest Jenkins LTS version will require JDK11 
for ALL build agents/machines. This applies to the communication between 
build agents and Jenkins controller only. This does not affect which JDK 
is used to build/test software.

For builds that are relying on the predefined docker images (basic, 
centos-7, centos-8), labels like "migration, centos-latest" or have not 
specified an image nothing needs to be changed. The "centos-8" image 
will be updated to use JDK11 by default, "basic" and "centos-7" already do.

Builds that use a custom docker images which are set to use JDK8 by 
default will fail with errors like:

"java.lang.UnsupportedClassVersionError: 
com/trilead/ssh2/ServerHostKeyVerifier has been compiled by a more recent
version of the Java Runtime (class file version 55.0), this version of 
the Java Runtime only recognizes class file
versions up to 52.0"

In that case, please update the images to use JDK11 by default or switch 
to a different image.

This might also affect dedicated/static build agents and cause slight 
interruptions.

Please let us know if you have any questions or concerns.

Regards,

Fred

--
Frederic Gurr
Team Lead - Release Engineering | Eclipse Foundation Europe GmbH

Berliner Allee 47, D-64295 Darmstadt
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Managing Directors: Gaël Blondelle, Mike Milinkovich, Michael Plagge