ByteBuffer.clear() method derives java.lang.NoSuchMethodError on java8

[LiuZheng-China]

ByteBuffer.clear() method behaves different on java 8 and java9 above,
when calling ByteBufferPool.release(this.buffer) in SeaweedOutputStream class, which calls obj.clear() method in ByteBufferPool class, No SuchMethodError appears on java 8.
The reason and solution is described in this article,
https://www.jianshu.com/p/8f219d981aa9?share_token=c541612b-25bd-4155-b02f-ddd58fd16771

[chrislusf]

Thanks a lot for the issue report and the solution! Added the fix. You are also welcome to create a PR later.