location « Legend « JFreeChart Q&A

1. How to specify exact location for legend items?    jfree.org

It isn't supported yet. A good option would be some kind of floating annotation for charts (to be displayed at some fixed (x, y) location within the chart area). An annotation that can display a Title instance would be able to handle a the chart legend as well as text and images.

3. Legend Location    jfree.org

4. Legend Location    jfree.org