How to change a Shape3D node's picked in the branchGroup loade by OBJ file

Hi,all
I need your help!
I loaded a OBJ file to add the its branchgroup to the scenegraph,then,I registered the mouse listener for the canvas3D, each time the canvas3D received a mouse click, i will use the pickInfo to get the picked node,then ,change its properties,such as appearance,transform3D,etc.
But now occurs the problems:I can pick the node,but it's just a Shape3D node,how can I change its Transform3D?
I try to change its appreance by:
Node node = closestRs.getNode();//the picked node
Shape3D nodeShape = (Shape3D)node;
nodeShape.setCapability(Shape3D.ALLOW_APPEARANCE_OVERRIDE_WRITE);
nodeShape.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
nodeShape.setCapability(Shape3D.ALLOW_PARENT_READ);
Appearance app = new Appearance();
ColoringAttributes ca = new ColoringAttributes();
ca.setColor(new Color3f(0.8f,0.3f,0.2f));
app.setColoringAttributes(ca);
nodeShape.setAppearance(app);
then,causes the following errors:
Exception in thread "AWT-EventQueue-1" javax.media.j3d.RestrictedAccessException: Cannot modify capability bits on a live or compiled object
at javax.media.j3d.SceneGraphObject.setCapability(SceneGraphObject.java:169)
at edu.whu.j3d.test.CanvasMouseListener.mouseClicked(CanvasMouseListener.java:46)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
at java.awt.Component.processMouseEvent(Component.java:6044)
at java.awt.Component.processEvent(Component.java:5806)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
how can I do this?
can you tell me how to complete my mission?Hope your help!

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