[JAVA3D] Capability not set Exception

[Brobbey,Isaac (neuron)]

 Dear all:

i have a little trouble reading all the Children from a branch group which i
created as follows:

private BranchGroup scene = new BranchGroup();

                scene.setCapability(BranchGroup.ALLOW_CHILDREN_READ);
                scene.setCapability(BranchGroup.ALLOW_CHILDREN_WRITE);
                scene.setCapability(BranchGroup.ALLOW_CHILDREN_EXTEND);

scene = createSceneGraph(vis);
System.out.println("all children="+scene.numChildren());

java.util.Enumeration enumChild = scene.getAllChildren();

when i run the code i get an error like

all children=3
javax.media.j3d.CapabilityNotSetException: Group: no capability to read
children

        at javax.media.j3d.Group.getAllChildren(Group.java:236)
        at GraphicDisplay.showChildren(GraphicDisplay.java:1098)
        at GraphicDisplay.actionPerformed(GraphicDisplay.java:822)
        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at
javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknow
n Source)

the same capability is set for each of the three children.I dont know of a
diffrent way of reading the children. i may be running out of Ideas , so any
help will be appreciated,

thanks,

Isaac

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