This is the same problem as issue#116 but with the latest lmdbjava 0.8.0. (I have JDK 8 on my machine.) I adapted my code for the CursorIterator design changes#154, but my project still failed with the NoSuchMethodError due to the (old) Java API changes in ByteBuffer between JDK 8 and 9. As discussed last time, JDK 8 is close to end of life. I updated to a JDK 11 and everything is working again for me. I suggest that you document the minimum required Java version.