OAuth2Authenticator.getOAuth2TokenPair() is unable to use refresh token

[maartenba]

OAuth2Authenticator.getOAuth2TokenPair() is unable to use refresh token. Here is what happens and what we see:

• When calling OAuth2Authenticator.getOAuth2TokenPair(), a token pair with an access token and a refresh token is returned. So far, so good.
• After one hour, the access token expires and when calling OAuth2Authenticator.getOAuth2TokenPair() again, this method tries to validate the access token. In this case, VSTS will return a 203 status code.
• When this happens, the library seems to expect an IOException to be thrown, which is not the case.
• Instead, a NullPointerException is thrown in HttpClientImpl, because the stream seems to be nonexistent in this call.

Net result: NullPointerException is never caught and bubbles up to the caller, making refresh tokens impossible to use.

I have created a pull request that fixes this NullPointerException. If possible, can a new build of the library be created?

/cc @DavidStaheli

[maartenba]

@DavidStaheli Any news on the Maven artifacts? :-)