code: public static void freeDirectNoCleaner(ByteBuffer buffer) {
          assert USE_DIRECT_BUFFER_NO_CLEANER;
  
          int capacity = buffer.capacity();
          PlatformDependent0.freeMemory(PlatformDependent0.directBufferAddress(buffer));
          decrementMemoryCounter(capacity);
      }
docs: This method <strong>MUST</strong> only be called for {@link ByteBuffer}s that were allocated via
  {@link #allocateDirectNoCleaner(int)}.