Icons missing from JAR file?

[imagingbook]

Shouldn't the icons (resources) in package org.math.plot.icons be contained in the distributed JAR file? They used to be in the older ZIP files but I cannot find them and a runtime (NullPointer) exception is thrown:

Exception in thread "main" java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source) at org.math.plot.components.PlotToolBar.(PlotToolBar.java:61) at org.math.plot.PlotPanel.addPlotToolBar(PlotPanel.java:149) at org.math.plot.PlotPanel.(PlotPanel.java:59) at org.math.plot.PlotPanel.(PlotPanel.java:67) at org.math.plot.Plot2DPanel.(Plot2DPanel.java:31)

[ahooper]

same problem (with Plot3DPanel), had to download source and add src/main/resources to run class path