Two identical process instances - one blocked, one running. Prints to console: Exception in thread "main" java.lang.NullPointerException at frysk.debuginfo.DebugInfo.<init>(FryskGui) at frysk.gui.srcwin.SourceWindow.generateProcStackTrace(FryskGui) at frysk.gui.srcwin.SourceWindow.finishSourceWin(FryskGui) at frysk.gui.srcwin.SourceWindow.access$32(FryskGui) at frysk.gui.srcwin.SourceWindow$2.run(FryskGui) at org.gnu.glib.CustomEvents.runEvents(libgtkjava-2.8.so) at org.gnu.gtk.Gtk.gtk_main(libgtkjava-2.8.so) at org.gnu.gtk.Gtk.main(libgtkjava-2.8.so) at frysk.gui.Gui.gui(FryskGui) at frysk.gui.FryskGui.main(FryskGui)