Error while running an example

[Vanchi Nathan]

hello all,

I have just used to sample code, HelloUniverse.java

The applet display but gives an error message as follows.

************************************************************************
*** ERROR: Canvas3D constructed with a null GraphicsConfiguration
*** This will cause a NullPointerException in a subsequent release
************************************************************************

Can anyone help me to rectify this error.

Thanks in advance.

[Ulf Dittmer]

Not knowing what HelloUniverse, GraphicsConfiguration or Canvas3D do, this is a bit tricky to answer.

Canvas3D constructed with a null GraphicsConfiguration

If this is true, and is part of your code, you might want to correct it (i.e., construct a Canvas3D with a non-null GraphicsConfiguration).

[Vanchi Nathan]

Hi,

Sorry for not putting the code.
This code snippet is taken from the tutorials for Java3D.

   public HelloUniverse() {
setLayout(new BorderLayout());
Canvas3D c = new Canvas3D(null);
add("Center", c);
 
// Create a simple scene and attach it to the virtual universe
BranchGroup scene = createSceneGraph();
SimpleUniverse u = new SimpleUniverse(c);
 
        // This will move the ViewPlatform back a bit so the
        // objects in the scene can be viewed.
        u.getViewingPlatform().setNominalViewingTransform();
 
u.addBranchGraph(scene);
    }  

How should i rectify the error?

[Ulf Dittmer]

Canvas3D c = new Canvas3D(null);

Do exactly what the error message suggests: don't create a Canvas3D with a null GraphicsConfiguration (I'm assuming the parameter is a GraphicsConfiguration).