building a jar with SMTP appender in it?

[Jeff Drew]

When I build an application .jar, I include the log4j classes I need. This
works fine. However, I'm now using SMTP appender and get an error.  I have
the activation.jar in my .jar in the same path as the jaf1-1 framework
does.  Here is the exception.

Any suggestions would be appreciated.

Thanks

Jeff

Exception in thread "main" java.lang.SecurityException: no manifiest section
for
signature file entry javax/activation/DataContentHandlerFactory.class
       at sun.security.util.SignatureFileVerifier.verifySection
(SignatureFileVe
rifier.java:329)
       at sun.security.util.SignatureFileVerifier.process0
(SignatureFileVerifie
r.java:241)
       at sun.security.util.SignatureFileVerifier.process
(SignatureFileVerifier
.java:191)
       at java.util.jar.JarVerifier.processEntry(JarVerifier.java:239)
       at java.util.jar.JarVerifier.update(JarVerifier.java:194)
       at java.util.jar.JarFile.initializeVerifier(JarFile.java:300)
       at java.util.jar.JarFile.getInputStream(JarFile.java:362)
       at sun.misc.URLClassPath$5.getInputStream(URLClassPath.java:619)
       at sun.misc.Resource.getBytes(Resource.java:57)
       at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
       at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
       at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
       at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)