Additional check of the "source" parameter. Based on the problem reported by SpotBugs 4.0.1. After adding a fix, any wrong calls of the first constructor will also be visible as a bug and can be caught earlier.
Comment From: pivotal-issuemaster
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Comment From: wilkinsona
Thanks for the suggestion but I would prefer to keep a single requireNonNull check in the constructor to which the other one delegates.