Please help with this error message

Question

java.lang.UnsatisfiedLinkError: C:\j2sdk1.4.1_01\jre\bin\J3D.dll: One of the library files needed to run this application cannot be found
     at java.lang.ClassLoader$NativeLibrary.load(Native Method)
     at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1473)
     at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1389)
     at java.lang.Runtime.loadLibrary0(Runtime.java:788)
     at java.lang.System.loadLibrary(System.java:832)
     at javax.media.j3d.MasterControl$20.run(MasterControl.java:848)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.media.j3d.MasterControl.loadLibraries(MasterControl.java:845)
     at javax.media.j3d.VirtualUniverse.<clinit>(VirtualUniverse.java:229)
     at RandyClasses.Buzz3D.Buzz3D.init(Buzz3D.java:625)
     at com.borland.jbuilder.runtime.applet.AppletTestbed.startApplet(Unknown Source)
     at com.borland.jbuilder.runtime.applet.AppletTestbed.main(Unknown Source)
Exception in thread "main"

Answer 1

Apart from what the exception already tells you (your Applet needs a library called J3D.dll but cannot find it), this always happens when the JVM tries to call native methods but is not provided with the libraries these native methods are implemented in.
If you know where to find J3D.dll you could try to start your JVM with the additional parameter -Djava.library.path=[pathToJ3D.dll].
If you can't find J3D.dll, make sure you have installed the Java3D Runtime.
If you have more than one SDK or JRE version installed on your system, make sure you use the correct one, that means, the one you installed your Java3D Runtime in.
I hope this helps.