Upgraded from 6.4.6 (SD 2.4.3) to 7.6.0 (SD 3.9.0).
If I try to change anything on a SD project (e.g. select "Request types") I'm getting
java.lang.IllegalArgumentException: cacheLoader returned null for key 'SD_REQTYPE'
From a few issues I've already worked on, this behavior you're experiencing is related to this upgrade path that you've proceeded with. As Service Desk has to run a few upgrade tasks on JIRA 7.0 or 7.1, the correct upgrade path should be like JIRA 6.4.6 > 7.0.x > 7.6.0.
Due to this, our advice would be to proceed with the steps of the KB article below (Section: Resolution for cause 1)
However and if you have a snapshot of your instance from before the upgrade, you can also roll back and proceed with the upgrade in two steps (From 6.4.6 to 7.0.x and then to the latest version)
Not sure if you're facing this behavior as Service Desk was disabled and the upgrade tasks were not completed. You can install Service Desk in both version (7.0/7.1) where I'd advice you to just install it through UI (JIRA Administration > Applications) as your instance will download the correct one.
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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