Java 3D 代码给出 java.lang.UnsatisfiedLinkError

Question

我正在尝试运行以下 Java 3D 示例代码。我指的是 3 个罐子和 1 个 dll 文件夹。他们的名字如下：-

1. vecmath.jar
2. j3d-core-1.3.1.jar
3. j3dutils.jar
4. j3dcore-ogl.dll（我也尝试引用一个 jar 文件而不是这个 dll 文件。jar 文件是 j3dcore-d3d_dll.jar）。

我也尝试将它们放在 jdk 和 jre 的 bin 和 lib 文件夹中。

我还在名为“Path”的系统环境变量中添加了那个 j3dcore-ogl.dll 文件的路径。后来我尝试用 j3dcore-d3d_dll.jar 文件的路径替换它。

代码如下：-

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.GraphicsConfiguration;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.media.j3d.AmbientLight;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.swing.Timer;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;

import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.Sphere;
import com.sun.j3d.utils.universe.SimpleUniverse;

public class InteractiveAnimation extends Applet implements ActionListener, KeyListener {

    private static final long serialVersionUID = 1L;

    private Button go = new Button("Go");

  private TransformGroup objTrans;

  private Transform3D trans = new Transform3D();

  private float height = 0.0f;

  private float sign = 1.0f; // going up or down

  private Timer timer;

  private float xloc = 0.0f;

  public BranchGroup createSceneGraph() {
    // Create the root of the branch graph
    BranchGroup objRoot = new BranchGroup();
    objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    objRoot.addChild(objTrans);

    // Create a simple shape leaf node, add it to the scene graph.
    Sphere sphere = new Sphere(0.25f);
    objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    Transform3D pos1 = new Transform3D();
    pos1.setTranslation(new Vector3f(0.0f, 0.0f, 0.0f));
    objTrans.setTransform(pos1);
    objTrans.addChild(sphere);
    objRoot.addChild(objTrans);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
        100.0);

    Color3f light1Color = new Color3f(1.0f, 0.0f, 0.2f);
    Vector3f light1Direction = new Vector3f(4.0f, -7.0f, -12.0f);
    DirectionalLight light1 = new DirectionalLight(light1Color,
        light1Direction);
    light1.setInfluencingBounds(bounds);
    objRoot.addChild(light1);

    // Set up the ambient light
    Color3f ambientColor = new Color3f(1.0f, 1.0f, 1.0f);
    AmbientLight ambientLightNode = new AmbientLight(ambientColor);
    ambientLightNode.setInfluencingBounds(bounds);
    objRoot.addChild(ambientLightNode);

    return objRoot;
  }

  public InteractiveAnimation() {
    setLayout(new BorderLayout());
    GraphicsConfiguration config = SimpleUniverse
        .getPreferredConfiguration();
    Canvas3D c = new Canvas3D(config);
    add("Center", c);
    c.addKeyListener(this);
    timer = new Timer(100, this);
    //timer.start();
    Panel p = new Panel();
    p.add(go);
    add("North", p);
    go.addActionListener(this);
    go.addKeyListener(this);
    // Create a simple scene and attach it to the virtual universe
    BranchGroup scene = createSceneGraph();

    SimpleUniverse u = new SimpleUniverse(c);
    u.getViewingPlatform().setNominalViewingTransform();
    u.addBranchGraph(scene);
  }

  public void keyPressed(KeyEvent e) {
    //Invoked when a key has been pressed.
    if (e.getKeyChar() == 's') {
      xloc = xloc + .1f;
    }
    if (e.getKeyChar() == 'a') {
      xloc = xloc - .1f;
    }
  }

  public void keyReleased(KeyEvent e) {
    // Invoked when a key has been released.
  }

  public void keyTyped(KeyEvent e) {
    //Invoked when a key has been typed.
  }

  public void actionPerformed(ActionEvent e) {
    // start timer when button is pressed
    if (e.getSource() == go) {
      if (!timer.isRunning()) {
        timer.start();
      }
    } else {
      height += .1 * sign;
      if (Math.abs(height * 2) >= 1)
        sign = -1.0f * sign;
      if (height < -0.4f) {
        trans.setScale(new Vector3d(1.0, .8, 1.0));
      } else {
        trans.setScale(new Vector3d(1.0, 1.0, 1.0));
      }
      trans.setTranslation(new Vector3f(xloc, height, 0.0f));
      objTrans.setTransform(trans);
    }
  }

  public static void main(String[] args) {
    System.out.println("Program Started");
    InteractiveAnimation bb = new InteractiveAnimation();
    bb.addKeyListener(bb);
    MainFrame mf = new MainFrame(bb, 256, 256);
  }
}

执行此操作时，我得到以下异常堆栈跟踪：-

线程“主”java.lang.UnsatisfiedLinkError 中的异常：java.library.path 中没有 J3D 在 java.lang.ClassLoader.loadLibrary（未知来源） 在 java.lang.Runtime.loadLibrary0（未知来源） 在 java.lang.System.loadLibrary（未知来源） 在 javax.media.j3d.MasterControl$22.run(MasterControl.java:889) 在 java.security.AccessController.doPrivileged（本机方法） 在 javax.media.j3d.MasterControl.loadLibraries(MasterControl.java:886) 在 javax.media.j3d.VirtualUniverse.(VirtualUniverse.java:229) 在 InteractiveAnimation.(InteractiveAnimation.java:84) 在 InteractiveAnimation.main(InteractiveAnimation.java:143)

我应该怎么做才能运行这个程序？

Answer 1

上面的cmets是完全错误的。 Java 3D 1.3.1 已完全过时，在最新版本的 Java 3D (1.6) 中不再需要手动处理 DLL。我解释如何安装它here。

Answer 2

安装 Java 3D（最新版本），而不是放置 jar。