trashgod

This looks like the expected result. As suggested [here](https://stackoverflow.com/a/23454262/230513) and [here](http://www.jfree.org/forum/viewtopic.php?f=3&t=109422&p=182660#p182660), you might review your expectation or precision.

You might look at a custom `PaintScale`, for [example](https://stackoverflow.com/a/37235165/230513).

In the example cited, it looks like you could change the value bounds, `lowerBound` & `upperBound`, and the hue bounds, `H1` & `H2`.

Your Java `headless` and environment `DISPLAY` settings may influence this, too.

>Is jfree related to the system? JFreeChart is pure Java, but the Java runtime relies on the system. As suggested [here](https://stackoverflow.com/a/13985919/230513), you may need to enable `headless` mode—"a system configuration...

Why not `java -Djava.awt.headless=true…`?

Are you saying that headless mode precludes `RenderingHints`? What happens without them? Also check your `DISPLAY` environment variable and [window manager](https://forums.centos.org/viewtopic.php?t=4674).

As shown [here](https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/swing002.html#BABCCFFD), "a component can only exist in one parent at a time."

The single parent rule is not version specific, for [example](https://docs.oracle.com/en/java/javase/11/troubleshoot/swing.html). The exact solution will depend on your use-case, but you should be able to construct a new `ChartPanel` from your...

I frequently migrate charts from v1.0.19 to v1.5.x with the default fonts, but I haven't encountered this. Do you have a short example and font that reproduces this.