In version 12 and 11.0.1 FP3 there is a new version of Guava library included (SPR# EPORBCTL47). It is included in the ndext folder. The included library is missing the failureaccess-1.0.1.jar . The https://guava.dev/ contains information that this dependency is needed at runtime.
Not including this library causes our code to throw java.lang.NoClassDefFoundError: com/google/common/util/concurrent/SettableFuture when classes from cache package are used.
Please include failureaccess-1.0.1.jar with Guava libraries.