How to manually add jar to JIRA?

Hi!

How to manually add library jar to JIRA?
I added it to JIRA/lib, restarted server,
but plugin can not see classes from new lib.

Hello arthurdnu! You need to be an admin on JIRA then navigate to “Add-Ons” --> “Manage Add-ons” then upload your plugin JAR. Make sure your JAR is correctly built and represents an actual plugin.

Thx @kallas.christian, I mean, library jar, Updated question.

Hi.
You should copy them under JIRA/atlassian-jira/WEB-INF/lib/