javax.mail.NoSuchProviderException: Invalid protocol: null

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javax.mail.NoSuchProviderException: Invalid protocol: null
at javax.mail.Session.getProvider(Session.java:431)
at javax.mail.Session.getTransport(Session.java:650)
at javax.mail.Session.getTransport(Session.java:631)
at javax.mail.Session.getTransport(Session.java:617)
at undefined.MailDemo.main(MailDemo.java:25)

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