java.lang.UnsatisfiedLinkError: no J3D in java.library.path
     at java.lang.ClassLoader.loadLibrary(Unknown Source)
     at java.lang.Runtime.loadLibrary0(Unknown Source)
     at java.lang.System.loadLibrary(Unknown Source)
     at javax.media.j3d.MasterControl$22.run(MasterControl.java:889)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.media.j3d.MasterControl.loadLibraries(MasterControl.java:886)
     at javax.media.j3d.VirtualUniverse.<clinit>(VirtualUniverse.java:229)
     at javax.media.j3d.Canvas3D.<clinit>(Canvas3D.java:3533)
     at Hello3d.main(Hello3d.java:28)
Exception in thread "main"

import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.*;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;

public class Hello3d
{
     public static void main( String[] args ) {
           Frame frame = new Frame( );
           frame.setSize( 640, 480 );
           frame.setLayout( new BorderLayout( ) );

           Canvas3D canvas = new Canvas3D( null );
           frame.add( "Center", canvas );

           SimpleUniverse univ = new SimpleUniverse( canvas );
           univ.getViewingPlatform( ).setNominalViewingTransform( );

           BranchGroup scene = createSceneGraph( );
           scene.compile( );
           univ.addBranchGraph( scene );

           frame.show( );
     }

     private static BranchGroup createSceneGraph( )
     {
           // Make a scene graph branch
           BranchGroup branch = new BranchGroup( );

           // Make a changeable 3D transform
           TransformGroup trans = new TransformGroup( );
           trans.setCapability( TransformGroup.ALLOW_TRANSFORM_WRITE );
           branch.addChild( trans );

           // Make a shape
           ColorCube demo = new ColorCube( 0.4 );
           trans.addChild( demo );

           // Make a behavor to spin the shape
           Alpha spinAlpha = new Alpha( -1, 4000 );
           RotationInterpolator spinner =
                 new RotationInterpolator( spinAlpha, trans );
           spinner.setSchedulingBounds(
                 new BoundingSphere( new Point3d( ), 1000.0 ) );
           trans.addChild( spinner );

           return branch;
     }
}

public void actionPerformed(ActionEvent input) {
           String evt = input.getActionCommand();
           String answer = evt;
           System.out.println(evt);
           if (evt == "good") {
                 question.setText("I'm glad to hear that.");
           } else if (evt == "great") {
                 question.setText("Great!");
           }else if (evt == "Terrible") {
                 question.setText("That's too bad");
           } else if (evt == "bad") {
                 question.setText("I hope you cheer up");
                 
           } else {
                 question.setText("Could you repeat that? I couldn't understand");
           }
           
           
           
     }