Thanks for the feedback. I guess you reported this to Oracle as well as I see it...
Memory Leak in drawing rotated string
org.jfree.text.TextUtilities#drawRotatedString(...) is not using argument textX
Thanks for the report. This one got resolved here: https://github.com/jfree/jcommon/issues/3...
Bug in BoxAndWhiskerRenderer.java
I believe this is fixed by this change, which was probably inspired by your bug report....
Pie Chart with Negative Values
Tracking this at GitHub: https://github.com/jfree/jfreechart/issues/39