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I understand that auto un-boxing should be done with care because the reference that is being un-boxed can be null. Why is auto-boxing marked as warning as well? Are there some pitfalls I am missing here?
If you don’t expect performance issues (in terms of micro-optimization) you can safely disable this warning. It is just an indication in case you’re not aware that auto-boxing happends here. In business-logic code where you have I/O overhead (due to DB transactions or disc access) auto-boxing hardly becomes a performance issue.