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java.lang.NoClassDefFoundError: javax/mail/Authenticator	at org.apache.naming.factory.MailSessionFactory.getObjectInstance(MailSessionFactory.java:105)	at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:140)	at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)	at org.apache.naming.NamingContext.lookup(NamingContext.java:793)	at org.apache.naming.NamingContext.lookup(NamingContext.java:140)	at org.apache.naming.NamingContext.lookup(NamingContext.java:781)	at org.apache.naming.NamingContext.lookup(NamingContext.java:140)	at org.apache.naming.NamingContext.lookup(NamingContext.java:781)	at org.apache.naming.NamingContext.lookup(NamingContext.java:140)	at org.apache.naming.NamingContext.lookup(NamingContext.java:781)	at org.apache.naming.NamingContext.lookup(NamingContext.java:153)	at org.apache.naming.SelectorContext.lookup(SelectorContext.java:137)	at javax.naming.InitialContext.lookup(InitialContext.java:392)	at com.atlassian.mail.server.impl.SMTPMailServerImpl.getJndiSession(SMTPMailServerImpl.java:161)	at com.atlassian.mail.server.impl.SMTPMailServerImpl.getSession(SMTPMailServerImpl.java:110)	at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:169)	at com.atlassian.jira.web.action.admin.mail.SendTestMail.doExecute(SendTestMail.java:88)	at webwork.action.ActionSupport.execute(ActionSupport.java:153)