using the latest Ejs 4.3.3.2 from http://www.compadre.org/osp/items/detail.cfm?ID=7305

but still have errors during running
Exception in thread "Thread-4" java.lang.ArrayIndexOutOfBoundsException: 500
at org.opensourcephysics.drawing3d.simple3d.SimpleElementTrail.computePositions(Unknown Source)
at org.opensourcephysics.drawing3d.simple3d.SimpleElementTrail.processChanges(Unknown Source)
at org.opensourcephysics.drawing3d.Element.processChanges(Unknown Source)
at org.opensourcephysics.drawing3d.ElementTrail.processChanges(Unknown Source)
at org.opensourcephysics.drawing3d.Group.processChanges(Unknown Source)
at org.opensourcephysics.drawing3d.simple3d.SimpleDrawingPanel3D.paintDrawableList(Unknown Source)
at org.opensourcephysics.drawing3d.simple3d.SimpleDrawingPanel3D.paintEverything(Unknown Source)
at org.opensourcephysics.drawing3d.simple3d.SimpleDrawingPanel3D.render(Unknown Source)
at org.opensourcephysics.drawing3d.simple3d.SimpleDrawingPanel3D.render(Unknown Source)
at org.opensourcephysics.drawing3d.DrawingPanel3D.render(Unknown Source)
at org.colos.ejs.library.control.drawing3d.ControlDrawingPanel3D.finalUpdate(Unknown Source)
at org.colos.ejs.library.control.EjsControl.finalUpdate(Unknown Source)
at org.colos.ejs.library.Animation.update(Unknown Source)
at org.colos.ejs.library.Animation.step(Unknown Source)
at org.colos.ejs.library.Animation.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

[s]anyone has suggestions how to overcome this [/s]
ok i overcome this by setting number of point in Trail = 499!