FULL PRODUCT VERSION :
java version "1.6.0_19"
Java(TM) SE Runtime Environment (build 1.6.0_19-b04)
Java HotSpot(TM) Client VM (build 16.2-b04, mixed mode, sharing)
Java Plug-in 1.6.0_19
Using JRE version 1.6.0_19-b04 Java HotSpot(TM) Client VM

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

EXTRA RELEVANT SYSTEM CONFIGURATION :
SSLv3 connection

A DESCRIPTION OF THE PROBLEM :
Unsigned applets that previously loaded from an HTML file using an <APPLET> tag under 1.6.0_18 and below now fail to load with class-not-found exception in the console. Applets are loaded from a website over an SSL connection. Setting the sun.security.ssl.allowUnsafeRenegotiation System property to true results in the applet executing normally.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create an applet and accompanying HTML on an SSL webserver with JSSE 1.6.0_19 installed on client. Log in an attempt to view the HTML/applet.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The applet should execute correctly.
ACTUAL -
The applet will fail to execute and the console should show a class not found exception.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
load: class <classname> not found.
java.lang.ClassNotFoundException: <classname>
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
load: class <class> not found.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Any applet should result in same outcome.
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Set the System property sun.security.ssl.allowUnsafeRenegotiation to true.

SUPPORT :
YES

Release Regression From : 6u18
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.