Hi I am having problems trying to find the proper graph/charting for the below requirements :

graph.bmp

I used JFreeChart to implement, basically using category axes, but I am still not able to get the required outcome,

do refer to the following website

java - JFreeChart 2 Bottom Domain Axes - Stack Overflow

No one was able to answer. It seems like its impossible to do the following on JFreeChart?