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I did some proof of concept (PoC) tests on a controlled network and everything was working perfectly.
The second test was supposed to be linking our test environment to the pipelines, on an actual server with real projects. Unfortunately I'm facing the following error when trying to start the runner.
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/atlassian/pipelines/runner/core/RunnerImpl 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 5
at java.lang.ClassLoader.defineClass1(Native Method)
at java.security.AccessController.doPrivileged(Native Method)
The PoC environment was an Ubuntu Server 20.04 and had no problem, it was surprisingly easy and smoothly.
The second env is a CentOS 7. On this server the runner din't even started.
Any suggestion to fix that?