Funny error! --- HELP

Question

Hi all, I am using JBuilder and try to compile a java program which is using java.security package.
It shows the error:
cyclic inheritance involving java.security.MessageDigest
And I try to introspect the MessageDigest class and get this results:
---------------------------------------------------- MessageDigest -----------------------------------------
// JBuilder API Decompiler stub source generated from class file
// 14/12/2004
// -- implementation of methods is not available
package java.security;
public abstract class MessageDigest extends MessageDigestSpi {
// Fields
private String algorithm;
private static final int INITIAL = 0;
private static final int IN_PROGRESS = 1;
private int state;
private Provider provider;
<....snip......>
---------------------------------------------------- MessageDigestSpi ------------------------------------
// JBuilder API Decompiler stub source generated from class file
// 14/12/2004
// -- implementation of methods is not available
package java.security;
public abstract class MessageDigestSpi extends MessageDigest {
// Constructors
public MessageDigestSpi() { }
Contradiction:
public abstract class MessageDigest extends MessageDigestSpi
VS.
public abstract class MessageDigestSpi extends MessageDigest
But when I goto command line window and try to introspect by using javap, then thing goes normal
javap java.security.MessageDigestSpi
Compiled from "MessageDigestSpi.java"
public abstract class java.security.MessageDigestSpi extends java.lang.Object{
protected int engineGetDigestLength();
public java.security.MessageDigestSpi();
protected abstract void engineReset();
protected abstract byte[] engineDigest();
protected abstract void engineUpdate(byte);
protected int engineDigest(byte[],int,int);
throws java/security/DigestException
protected abstract void engineUpdate(byte[],int,int);
public java.lang.Object clone();
throws java/lang/CloneNotSupportedException
I've checked the JRE and JDK version, i'm using the same for JBuilder
Is that JBuilder error? And how to fix?
Thanks very much
Trung

Answer 1

Thanks Peter. It is the problem of incompatibility.
In the bunch of libraries, I found one lib that contain java.security package, I believe that it was included for the backward compatibility with JDK 1.1.
Just remove that lib and I get my code compiled.
Once again, thanks alot.
Trung