从 .jar 运行应用程序时出现 Java 3d 错误

Question

Hello when i am running my application from Eclipse it runs perfectly but when i export it as a runnable jar, it doesn't run. When i try running it from cmd it gives me one of 2 errors the first errror is after i just export it with the "copy required libraries into a sub-folder":

Exception in thread "main" java.lang.UnsatisfiedLinkError: no j3dcore-ogl 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.NativePipeline$1.run(NativePipeline.java:189)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.media.j3d.NativePipeline.loadLibrary(NativePipeline.java:180)
    at javax.media.j3d.NativePipeline.loadLibraries(NativePipeline.java:137)
    at javax.media.j3d.MasterControl.loadLibraries(MasterControl.java:948)
    at javax.media.j3d.VirtualUniverse.<clinit>(VirtualUniverse.java:280)
    at javax.media.j3d.Canvas3D.<clinit>(Canvas3D.java:3862)
    at Main.Game.<init>(Game.java:39)
    at Main.Main.main(Main.java:6)

when i change the sub-folder's name from IslandDomination_lib to just lib it gives me another error:

    Exception in thread "main" java.lang.NoClassDefFoundError: javax/media/j3d/Canvas3D
      at Main.Main.main(Main.java:6)
    Caused by: java.lang.ClassNotFoundException: javax.media.j3d.Canvas3D
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 1 more

I have tried running it several ways:

1.

java.exe -jar IslandDomination.jar

2.

java.exe -cp "lib/j3dcore.jar;lib/j3dutils.jar;lib/vecmath.jar" -jar IslandDomination.jar

3. using another java program to run it for me:

package main;
import java.io.File;
import java.io.IOException;

public class Main {
  public static void main(String[] args) throws IOException,     InterruptedException{
    ProcessBuilder pb = new   ProcessBuilder(System.getProperty("java.home")+"\\bin\\java.exe", "-cp" , "\"lib/j3dcore.jar;lib/j3dutils.jar;lib/vecmath.jar\"" , "-jar" , "IslandDomination.jar");
    pb.directory(new File("./"));
    Process p = pb.start();
    p.waitFor();
  }
}

The internal structure of my jar consists of 4 folders:

J3DBool
Main
Maths
META-INF

The folder with the required jars is in the same folder as the main jar

Answer 1

You use a completely obsolete version of Java3D, which is very difficult to bundle in any software as you have to set the Java library path somehow and you have to bundle both the Java libraries and the native libraries. Rather rebuild your project with Java3D 1.6.0 pre 12, it's a lot easier to use as this version relies on JOGL 2 which uses automatic native library loading and everything is packaged as JARs, there is no longer any need of modifying the library path, just take care of the classpath.

Please follow my tutorial , especially the very last section with (a lot) more information.

Finally, the obsolete version that you use isn't guaranteed to work on any recent operating systems. If it works, you'll be lucky; if it doesn't, nobody will fix it.

Answer 2

I think the required library file (jar file) not found in the classpath.

you need to set Library file in your class path.

step to set class path:-

MyComputer->Properties->Advanced system setting->Environment variables

find "classpath" either in user variables area or in system variables if found edit that and put all the jar file link. if not found then create new(click on new) and put all the jar link there and try to run your application

Answer 3

我发现了如何解决我的问题，只需将所需的 dll 文件放在可执行 jar 文件旁边即可完成