HashCollisionsClusteringTest.testHashSetClusteringAtFront2 test is failing for me via mvn clean test (tested with 5d610017c252fd4fa21213fa433b217156d88de8 and tag 0.7.1).
java -version java version "1.8.0_51" Java(TM) SE Runtime Environment (build 1.8.0_51-b16) Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)