I have tried importing bugzilla into 2.3 (since 2.4.1 being broken is a known bug).
I have problems with the following:
- most web browsers/proxies seem to timeout on a request that takes this long (an hour or more with a large bugzilla database). To get around this, I do a GET request on the bugzilla import using a tool that controls/ignores the timeout, and send the JSESSIONID cookie so it will log in.
- I get the following exception, presumable because the session timeout is less than the length of time it takes.
[10:09:56] java.lang.IllegalStateException: getAttribute: Session already invalidated
I would suggest that the bugzilla -> XML process should be a separate Java application, and this XML should then be imported via the regular JIRA mechanism.
I rate this as major as it could potentially push our company's decision to adopt JIRA over our existing bugzilla installation into the negative. We are currently evaluating it.