Getting error while adding gmail as SMTP Mail Server for JIRA

[Hemant Gupta]

I am getting the following error while specifying JNDI value as

java:comp/env/mail/GmailSmtpServer

Referer URL: http://myhostname:8080/secure/admin/AddSmtpMailServer!default.jspa
java.lang.NoClassDefFoundError: javax/mail/Authenticator
java.lang.NoClassDefFoundError: javax/mail/Authenticator
	at org.apache.naming.factory.MailSessionFactory.getObjectInstance(MailSessionFactory.java:104) [catalina.jar:8.0.33]
	at org.apache.naming.factory.FactoryBase.getObjectInstance(FactoryBase.java:94) [catalina.jar:8.0.33]
	at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321) [?:1.8.0_102]
	at org.apache.naming.NamingContext.lookup(NamingContext.java:841) [catalina.jar:8.0.33]
	at org.apache.naming.NamingContext.lookup(NamingContext.java:152) [catalina.jar:8.0.33]
	at org.apache.naming.NamingContext.lookup(NamingContext.java:829) [catalina.jar:8.0.33]
	at org.apache.naming.NamingContext.lookup(NamingContext.java:152) [catalina.jar:8.0.33]
	at org.apache.naming.NamingContext.lookup(NamingContext.java:829) [catalina.jar:8.0.33]
	at org.apache.naming.NamingContext.lookup(NamingContext.java:152) [catalina.jar:8.0.33]
	at org.apache.naming.NamingContext.lookup(NamingContext.java:829) [catalina.jar:8.0.33]
	at org.apache.naming.NamingContext.lookup(NamingContext.java:166) [catalina.jar:8.0.33]
	at org.apache.naming.SelectorContext.lookup(SelectorContext.java:157) [catalina.jar:8.0.33]
	at javax.naming.InitialContext.lookup(InitialContext.java:417) [?:1.8.0_102]

[Nic Brough {Adaptavist}]

Did you move the jar files as per documentation?