For tracking issues(Your title was a little confusing, but from the
iTracker example I figured that you are looking for an issue-tracker) and the requirement that the software needs to be in
java language, the most known software is definitely JIRA.
- It supports multilanguage, link
- Mysql support, link
- Look and feel configuration, link
Definitely maintained and alive, actually most open-source projects I follow use JIRA.
Open source but not entirely, check the Wikipedia article.
And a screenshot:
Example: A client makes a complain about a missing item in your website so he creates an issue(ticket) in Jira and says "Filippo, where are my multi-billion dollars products in the main page?" and he passes you the issue.
then you assign this issue to somebody responsible for that and
then he resolves it back to the client who
then closes it because it's fixed now.
The whole process is monitored through Jira with details.
P.S I was confused by the title because a Help Desk implementation generally is a ticket system which is usually an issue tracking system like JIRA, your question was fine really :)