I'm using a base install of 4.05GA and I get the following exception when trying to use javamail. I'm using the default service bound to java:/Mail. java.lang.NoClassDefFoundError: com/sun/mail/util/SharedByteArrayInputStream I get the mail session fine, but when I try to create a MimeMessage object like so: Message m = new MimeMessage(mailSession); //this also fails: MimeMessage m = new MimeMessage(mailSession); I get the exception. Any ideas? Thanks!! B View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3980063#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...