Draw Charts using Java for Google App Engine

We require the following 4 types of graphs(photos attached) to be created using Java and jcharts - 1. A bar chart with marked area (in grey in figure). For the same graph different area marking and bars are required as shown in the attached images. For the charts - 1. Marking has to be as per the attached images. 2. Color has to be as per the the attached images. The output is to be an image object that can be added to a pdf using itextpdf.