We have a registered Hook for metrics purposes, which transforms Monos and Fluxes. When using in in conjunction with collectList and flatMap, we get a ClassCastException (see example below): java.lang ...

java.lang.ClassCastException's for Cat, Frog, Painting, Wolf #799 New issue Closed Techirion ...

Compare inheritance and composition, the two fundamental ways to relate Java classes, then practice debugging ClassCastExceptions in Java inheritance.