Hi Marat,
I understand that you are seeing some strange characters on a Jira issue page, specifically in the issue link / confluence page link section. I have seen this issue before, but there can be a few different things to cause this. It tends to happen because either Jira or Confluence (or both) applications are during different character encodings for their specific Java run time environments.
In Jira:
I would first recommend trying to follow the KB JIRA Application internationalisation and encoding troubleshooting. We recommend that Jira use a UTF-8 encoding in the java runtime, but Jira can't always set this in the environment. It tends to be largely dependent upon the JRE/JDK runtime that Jira opens up in, but you can follow the steps in that KB to set this manually:
Start JIRA with the parameters -Dfile.encoding=utf-8 and -Dsun.jnu.encoding=UTF-8. See Setting properties and options on startup.
Try that first, set those two startup arguments, and restart Jira to see if this helps. If you still see this same problem, then I would proceed to the next steps.
In Confluence:
I would interested to see if you can run the Character Encoding test as outlined in Troubleshooting Character Encodings. These results can probably give us more details on where to focus next if the problem persists.
Please let me know the results.
Andy
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