Is there someone here to help us with upgrading Confluence 5.x to 6.15.10.
We tried upgrading it several times. But no luck. It keeps ending up in error messages. The last messages we got is that the JRE_HOME environmental table isn't set, while this was set.
I tried Googling this message and tried all options without any luck. We need to update it to a newer version to go the Cloud in the end.
There were a number of changes made over the course of Version 6. I would try to upgrade to an earlier version (like the first LTS version) to get through the first set of changes.
And then upgrade to the last LTS version, 6.13.23. That will get you all of the fixes for version 6
When I've run into problems upgrading from Jira 5.x to 6.x, it's always been fixed by taking 5.x to 5.10.highest and then upgrading the resulting system again to 6.0 or 6.6, then up to whatever the target version is (the last one was fine jumping from 6.6 to 7.13 - the last long-term-support)
I wouldn't bother with 5.10.9.
5.10.1, 5.10.2 and so on, through to 5.10.9 are minor releases (tweaks, bug fixes, corrections), and are very unlikely to introduce anything that's going to make your upgrade to 6.0 or 6.6 easier or more difficult. I was thinking more about the case where you're starting with 5.1 or 5.2 - those should be taken up to 5.10 before going up to 6.6
Yes, the upgrade process is two parts - the first part is you physically updating the installation, and then the data needs to be upgraded to the new model. So when an upgraded system first starts up, there can be a lot of database updates to make before it becomes usable. Plus a re-index.
As the question to troubling upgrade processes repeats recently in Community.
If your own staff gets stucks with migrated trained and skilled partners are available which are experienced in doing upgrades and complex migrations.
You can locate a partner near you from partner directory: