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Yes, we mentioned this change in our Upgrading Guide.
JCache module can be used either with Uber Jar (infinispan-embedded) or Small Jars. Since Infinispan logger configuration clashes with your deployment, you need to use the latter. So just add org.infinispan:infinispan-core to your classpath.
Yes, that seems to have done it. I think I got it confused with another error that started occurring after the upgrade, but I will post that separately.