FULL PRODUCT VERSION :
java version "1.6.0-beta2"
Java(TM) SE Runtime Environment (build 1.6.0-beta2-b86)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0-beta2-b86, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux powerpig 2.6.15-gentoo-r7 #11 SMP PREEMPT Sun Jun 25 09:52:42 CEST 2006 x86_64 AMD Turion(tm) 64 Mobile Technology MT-30 AuthenticAMD GNU/Linux

A DESCRIPTION OF THE PROBLEM :
SecretKeyFactory.getInstance("PBEWithMD5AndDES");

results in:

java.security.NoSuchAlgorithmException: PBEWithMD5AndDES SecretKeyFactory not available

It worked in jdk1.6.0-beta-1 . However this wasn't a selection so I was not 
able to tell this. Nothing really - this has always worked, and have also worked in the mustang releases except this last beta2 release.

I ran this small program on my Gentoo-Linux AMD64 (using mustang for amd64 
linux), and got the exception. This exception doesn't happen on earlier 
releases.

REGRESSION.  Last worked in version mustang

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
import java.security.NoSuchAlgorithmException;

import javax.crypto.SecretKeyFactory;


public class JSE6SecretKeyFactoryTest {

	/**
	 * @param args
	 * @throws NoSuchAlgorithmException
	 */
	public static void main(String[] args) throws NoSuchAlgorithmException {
		SecretKeyFactory.getInstance("PBEWithMD5AndDES");
	}

}


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The code above should not produce any output
ACTUAL -
Exception in thread "main" java.security.NoSuchAlgorithmException: PBEWithMD5AndDES SecretKeyFactory not available
	at javax.crypto.SecretKeyFactory.<init>(DashoA13*..)
	at javax.crypto.SecretKeyFactory.getInstance(DashoA13*..)
	at tests.JSE6SecretKeyFactoryTest.main(JSE6SecretKeyFactoryTest.java:16)


ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.security.NoSuchAlgorithmException: PBEWithMD5AndDES SecretKeyFactory not available
	at javax.crypto.SecretKeyFactory.<init>(DashoA13*..)
	at javax.crypto.SecretKeyFactory.getInstance(DashoA13*..)
	at tests.JSE6SecretKeyFactoryTest.main(JSE6SecretKeyFactoryTest.java:16)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.security.NoSuchAlgorithmException;

import javax.crypto.SecretKeyFactory;


public class JSE6SecretKeyFactoryTest {

	/**
	 * @param args
	 * @throws NoSuchAlgorithmException
	 */
	public static void main(String[] args) throws NoSuchAlgorithmException {
		SecretKeyFactory.getInstance("PBEWithMD5AndDES");
	}

}

---------- END SOURCE ----------

Release Regression From : mustang
The above release value was the last known release where this 
bug was not reproducible. Since then there has been a regression.