canvas3d问题

本人写了一个小的Java 3d程序
运行出现的问题是：
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:138)
at java.security.AccessController.doPrivileged(Native Method)
at javax.media.j3d.NativePipeline.loadLibrary(NativePipeline.java:135)
at javax.media.j3d.NativePipeline.loadLibraries(NativePipeline.java:95)
at javax.media.j3d.MasterControl.loadLibraries(MasterControl.java:785)
at javax.media.j3d.VirtualUniverse.<clinit>(VirtualUniverse.java:259)
at javax.media.j3d.Canvas3D.<clinit>(Canvas3D.java:3813)
at twin.applet.test1.SimpleCone.<init>(SimpleCone.java:27)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
希望有人帮忙解决！再次先谢谢！