Github user aledsage commented on the pull request: https://github.com/apache/incubator-brooklyn/pull/1110#issuecomment-165446246 @ahgittin thanks. Interesting we weren't getting any `ConcurrentModificationException`s that I noticed. Instead we just had some subset of the 100 setAttribute calls actually having worked! I encountered this when writing tests for https://github.com/brooklyncentral/advanced-networking/pull/86. It was most confusing and frustrating when assuming the bug was in advanced-networking, until I left the advanced-networking and tried a simple tests in brooklyn! @sjcorbett thanks; will update that javadoc and then merge.
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