Major Description
Like with all other SASL mechanisms, OAUTHBEARER uses the same LoginModule class on both server-side and the client-side. But unlike PLAIN or SCRAM where client credentials are optional, OAUTHBEARER requires always requires a token. So while with PLAIN/SCRAM, broker only needs to specify client credentials if the mechanism is used for inter-broker communication, with OAuth, broker requires client credentials even if OAuth is not used for inter-broker communication. This is an issue with the default `OAuthBearerUnsecuredLoginCallbackHandler` used on both client-side and server-side. But more critically, it is an issue with `OAuthBearerLoginModule` which doesn't commit if token == null (commit() returns false).
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