Jar dependency import not working for jars not organized in directories

Hello, 

Perhaps a very simple issue. Here I have imported two local jars as libraries. One of them is organized as org.bonej.* and that works fine. The other one has a  class directly under the Jar and the compiler does not recognize it. I verified by trying other Jar libraries that the issue for me is the Jar file structure. I simply couldn't access any of the classes that exist under the jar directly. 
Can you direct me to access them? or is that a bug?

Thanks,