Github user aledsage commented on the pull request:
https://github.com/apache/incubator-brooklyn/pull/471#issuecomment-71718907
@michaeldye I agree that: if any of the Strings in `items` is null, it
should throw an exception that includes the rest of the path in its message.
I'd prefer a `NullPointerException` rather than an
`IllegalArgumentException`. To quote Joshua Bloch's Effective Java item 60: "If
a caller passes null in some parameter for which null values are prohibited,
convention dictates that NullPointerException be thrown rather than
IllegalArgumentException."
You can call the NPE constructor that takes a String, so can still pass in
the message.
If you can update the PR accordingly (and ideally add a test case to
`brooklyn.util.net.UrlsTest`), then that would be fantastic.
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