Profiling revealed some allocations that are easy to remove:

• The HotRod operations factory stores a list of flags in a thread-local. The thread-local can be removed, and the flags can be stored in an int.
• JGroupsTransport copies the list of members to check if a broadcast should be sent as a unicast, and the copy is then discarded.
• ExtendedByteBuf could use Array.empty instead of Array[Byte]().
• DecoratedCache could avoid calling Arrays.asList().