Exception using Resource Owner flow

[lomori]

Enabled Resource Owner flow by updating DefaultOAuth2ProviderTokenService:

<oauth:authorization-server ... >

...
<oauth:password authentication-manager-ref="authenticationManager" />
...
/oauth:authorization-server

But got the exception below:
…

root cause

java.lang.NumberFormatException: null

java.lang.Long.parseLong(Long.java:552)

java.lang.Long.parseLong(Long.java:631)

org.mitre.openid.connect.service.impl.DefaultOIDCTokenService.createIdToken(DefaultOIDCTokenService.java:112)

org.mitre.openid.connect.token.ConnectTokenEnhancer.enhance(ConnectTokenEnhancer.java:128)

org.mitre.oauth2.service.impl.DefaultOAuth2ProviderTokenService.createAccessToken(DefaultOAuth2ProviderTokenService.java:178)

org.mitre.oauth2.service.impl.DefaultOAuth2ProviderTokenService.createAccessToken(DefaultOAuth2ProviderTokenService.java:64)

org.springframework.security.oauth2.provider.token.AbstractTokenGranter.getAccessToken(AbstractTokenGranter.java:70)

…

The code in DefaultOIDCTokenService is expecting the authorization time to be present, which is at some earlier point set by AuthenticationTimeStamper called as an event handler for successful logins from the login page. However since the Resource Owner doesn't have a login page the event is not triggered.