Compiled and run it with java7, and did the same with java8.
This is the result:
java version "1.7.0_60-ea"
Java(TM) SE Runtime Environment (build 1.7.0_60-ea-b04)
Java HotSpot(TM) Client VM (build 24.60-b07, mixed mode, sharing)
operations: 17176 time 2397
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b128)
Java HotSpot(TM) Client VM (build 25.0-b69, mixed mode)
operations: 17176 time 12498
Oracle cannot deploy an engine that is so much slower than the previous one.
Impact: High, performance degradation
Workaround: Medium, unknown
ILW = HMM => P2