java3d调用了VRML文件在eclipse上能运行，但在浏览器上运行出错，WHY?
我用java3d写了一个applet程序，程序中调用了VRML文件。在eclipse中能运行，放在网页中就运行不了。我写的代码如下：
import java.applet.Applet;  
import java.awt.BorderLayout;  
import com.sun.j3d.utils.applet.MainFrame;  
import com.sun.j3d.utils.universe.*;  
import javax.media.j3d.*;  
import javax.vecmath.*;  
import org.jdesktop.j3d.loaders.vrml97.VrmlLoader;  
import com.sun.j3d.loaders.Scene;
import java.awt.GraphicsConfiguration;
import java.io.*;

public class Vrml1 extends Applet {  
 
public void init() {
//filename = args[0];  
setLayout(new BorderLayout());  
Canvas3D c = new Canvas3D(SimpleUniverse.getPreferredConfiguration());  
add("Center", c);  
BranchGroup scene = createSceneGraph();  
SimpleUniverse u = new SimpleUniverse(c);  
u.getViewingPlatform().setNominalViewingTransform();  
u.addBranchGraph(scene); 
}

/**
* 
*/
private static final long serialVersionUID = -6019133668952244907L;
//private String filename = "SKXC.wrl";  
 
public BranchGroup createSceneGraph() {  
BranchGroup objRoot = new BranchGroup();  
TransformGroup objScale = new TransformGroup();
Transform3D t3d = new Transform3D();  
t3d.setScale(0.3);  
objScale.setTransform(t3d);  
objRoot.addChild(objScale);  
 
Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f);  
Vector3f light1Direction = new Vector3f(4.0f, -7.0f, -12.0f);

BoundingSphere bounds =  
new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);


DirectionalLight light1 = new DirectionalLight(light1Color, light1Direction);  
light1.setInfluencingBounds(bounds);  
objRoot.addChild(light1);  
 
TransformGroup objTrans = new TransformGroup();  
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);  
objScale.addChild(objTrans); 

VrmlLoader loader = new VrmlLoader();  
Scene s = null;  

try {  
s = loader.load("SKXC.wrl");  
} catch (Exception e) {  
System.err.println(e);  
System.exit(1);  
}  
 
objTrans.addChild(s.getSceneGroup());  
Transform3D yAxis = new Transform3D();  
Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE,  
0, 0,  
4000, 0, 0,  
0, 0, 0);  
RotationInterpolator rotator =  
new RotationInterpolator(rotationAlpha, objTrans, yAxis,  
0.0f, (float) Math.PI*2.0f);  
rotator.setSchedulingBounds(bounds);  
objTrans.addChild(rotator);  
 
objRoot.compile();
return objRoot;
}

public Vrml1() { 
//filename = args[0];  
setLayout(new BorderLayout());  
Canvas3D c = new Canvas3D(SimpleUniverse.getPreferredConfiguration());  
add("Center", c);  
BranchGroup scene = createSceneGraph();  
SimpleUniverse u = new SimpleUniverse(c);  
u.getViewingPlatform().setNominalViewingTransform();  
u.addBranchGraph(scene);  
}


}


然后html代码如下：<applet code="Vrml1" ARCHIVE="Vrml1.jar" width=600 height=400>
</applet>
在网页中运行出错为：
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.1)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
at java.security.AccessController.checkPermission(AccessController.java:546)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)