CursorTest.java

ByteBuffer seekKey = ByteBuffer.allocateDirect(4).putInt(4);

try (Cursor cursor = db.openCursor(tx)) {
  if (cursor.get(seekKey, MDB_SET_KEY)) {
    // regular users
    ByteBuffer key = cursor.key();
    ByteBuffer val = cursor.val();
    do {
      // advanced users
      long keyAddress = cursor.keyAddress();
      long keySize = cursor.keySize();

      long valAddress = cursor.valAddress();
      long keySize = cursor.valSize();
    } while (cursor.get(MDB_NEXT));
  }
}