Follow-up: The error only occurs because I have scratch code encryption
enabled. With scratch code encryption disabled, the problem does not occur
and registration works fine.
Le mardi 22 septembre 2026 à 15:32:17 UTC+2, Bruno Elie a écrit :
> Hi, Hi all,
>
> In a test environment, after upgrading CAS from 7.3.8.2 to 8.0.1.2 (WAR
> overlay, JDK 25, Tomcat 11, external servlet container), registering a new
> Google Authenticator device fails when the account registry is backed by
> MongoDB (cas-server-support-gauth-mongo).
>
> On registration, OneTimeTokenAccountSaveRegistrationAction throws:
>
> ERROR
> [org.apereo.cas.otp.web.flow.OneTimeTokenAccountSaveRegistrationAction]
> Can't find a codec for CodecCacheKey{clazz=class java.math.BigInteger,
> types=null}
> ProvidersCodecRegistry.java:lambda$get$0:86
> ProvidersCodecRegistry.java:get:79
> ChildCodecRegistry.java:get:68
>
> This suggests the MongoDB driver bump that came with the 8.0 baseline no
> longer registers a BigInteger codec that was previously available. This
> worked fine on 7.3.8.2 with the same MongoDB backend and configuration.
>
> Test environment:
> - CAS [ 8.0.1 and also 8.0.1.2 ]
> - JDK 25, Tomcat 11 (external)
> - MFA: Google Authenticator, registry = MongoDB
> (cas-server-support-gauth-mongo)
> - Upgraded from 7.3.8.2 (where this worked)
>
> Questions:
> 1. Is this a known regression in 8.0.x with the MongoDB driver ?
> 2. Is there a workaround ?
>
> Thanks for any pointers.
>
> Best regards,
> Bruno
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