From Craig Ringer:

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Since `resolve(…)` doesn’t take a `Collection`, only an array, I have to accumulate in a set or list then pass an array view of it to resolve(), eg given a Set artifacts:

archive.addAsLibraries(resolver.resolve(artifacts.toArray(new String[artifacts.size()])).withTransitivity().as(File.class));

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Save the user the extra step of having to convert Collections to an array by enhancing the API to accept Collections natively.