From your file list, can you post here separately, lines 65 and 71 of DotPlot.java; and lines 98, 129, 168, 184, 220, and 257 of DotPlotUI.java. It appears the above lines have been cut short by the maximum page width.
Can you elaborate more on your GUI code.. for example, why do you have your GUI code which named after DotPlot.java, and yet you link to a complete DotPlot.java file?