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https://wiki.eclipse.org/JDT_Core/Null_Analysis/External_Annotations#References as e.g. mentioned on https://bugs.eclipse.org/bugs/show_bug.cgi?id=481931 A "tool for analysing non-annotated third party libraries to produce such *.eea files (from source or binary, ideally both)" ...
Which 3rd party formats do you have in mind? The bug summary speaks of transforming, so let's keep the focus in this bug on that. This does not include implementing our own tool for inferring missing annotations.