There are formatting errors in the PhongMaterial javadoc (strange {@code sequences), for example the javadoc contains text like below:

  "The bump map of this {@code PhongMaterial)."

http://download.java.net/jdk8/jfxdocs/javafx/scene/paint/PhongMaterial.html#bumpMapProperty

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There is nothing in the javadoc to indicate that an input bump image should be encoded as a normal map.

Please update the javadoc to specify that the input map must be a normal map and not a height map.
I made the mistake of inputting a height map and thought the bump feature was just broken.
The filers of RT-31455 and RT-29258 were similarly confused.