In wca4z modernization, when would an anti-corruption layer be used between a new Java service and a legacy COBOL subsystem?

Think of it like working hands-on with IBM mainframe systems — the answer here is 'When the wca4z IDE plugin cannot generate Java for programs with COBOL EVALUATE statements'. An anti-corruption layer translates between the Java service's domain model and the legacy COBOL system's data formats such as packed decimal, EBCDIC strings, and fixed-length records at the integrati. On real mainframe exams, this concept comes up repeatedly so make sure you have it locked in.