FULL PRODUCT VERSION :
java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux dev1.site 3.7.10-1.40-desktop #1 SMP PREEMPT Thu Jul 10 11:22:12 UTC 2014 (9b06319) x86_64 x86_64 x86_64 GNU/Linux

EXTRA RELEVANT SYSTEM CONFIGURATION :
tomcat 5.15

A DESCRIPTION OF THE PROBLEM :
In a JNLP application, when attempting to load a class from the BouncyCastle mail jar that in turn imports the javax.mail.MessagingException class, a ClassNotFoundException is thrown. It is important to note that the application runs fine as a normal java program.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the test jnlp program.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It should print "Found classes." to standard out.
ACTUAL -
The JNLP download dialog appears and then reports an Application Error.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.ClassNotFoundException: javax.mail.MessagingException
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com.oss.main.TryMain.main(TryMain.java:10)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.javaws.Launcher.executeApplication(Unknown Source)
at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
The Main class:

package com.oss.main;

import org.bouncycastle.mail.smime.SMIMESignedGenerator;


public class TryMain
{
  public static void main( String[] args )
  {
    SMIMESignedGenerator gen = new SMIMESignedGenerator();
    System.out.println( "Found classes." );
  }
}

The JNLP file:

<?xml version="1.0" encoding="utf-8"?>
<!-- JNLP File for Test -->

<jnlp spec="1.0+" codebase="$$codebase" href="Test.jnlp">
   <information>
      <title>Test</title>
      <vendor>OSS, LLC</vendor>
      <application-desc>Test of ClassNotFoundException for javax.mail.MessagingException</application-desc>
   </information>
   <resources>
    <!-- Application jars -->
    <jar href="main.jar" main="true"/>
    <jar href="javax.mail.jar"/>
    <jar href="bcpg-jdk15on-151.jar"/>
<jar href="bcprov-jdk15on-151.jar"/>
<jar href="bcmail-jdk15on-151.jar"/>
    <jar href="bcpkix-jdk15on-151.jar"/>
    
<j2se version="1.7+" href="http://java.sun.com/products/autodl/j2se"/>
    
   </resources>
   
   <application-desc main-class="com.oss.main.TryMain"/>
   
  <security>
   <all-permissions/>
</security>
</jnlp>

All the jars are signed by with my cert and the BouncyCastle jars are also signed by them as a JCE provider.
---------- END SOURCE ----------

SUPPORT :
YES