It turns out that the commons net IMAP package can do oauth2 style of
authentication just fine. I can do this:
String userNamePlusAccessToken = combine( username, accessToken )
according to e.g.
https://learn.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth
or
https://developers.google.com/gmail/imap/xoauth2-protocol
I got the OAuth2 accessToken via use of msal4j:
https://github.com/AzureAD/microsoft-authentication-library-for-java
Then
AuthenticatingIMAPClient aic = new AuthenticatingIMAPClient(true);
aic.connect( server );
aic.auth( AuthenticatingIMAPClient.AUTH_METHOD.XOAUTH2,
userNamePlusAccessToken, "passwordNotUsed" );
Just wanted this documented should others need to solve same problem.
Stuart
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