Is

            STREAM_STATE = MethodHandles.lookup()
                    .findVarHandle(Stream.class, "streamState", int.class);
            DEREGISTERED = MethodHandles.lookup()
                    .findVarHandle(Stream.class, "deRegistered", boolean.class);

Can be
            
            MethodHandles.Lookup lookup = MethodHandles.lookup();
            STREAM_STATE = lookup
                    .findVarHandle(Stream.class, "streamState", int.class);
            DEREGISTERED = lookup
                    .findVarHandle(Stream.class, "deRegistered", boolean.class);