When validating a Java module that replaced COBOL with embedded DB2 SQL, what does a DB2 mock framework provide?

Think of it like working hands-on with IBM mainframe systems — the answer here is 'A full DB2 for z/OS subsystem running in a Docker container for production-equivalent testing'. A DB2 mock framework intercepts JDBC calls and returns predefined result sets, allowing developers to test Java DB2 access logic in isolation without needing a live DB2 subsystem, accelerating local d. On real mainframe exams, this concept comes up repeatedly so make sure you have it locked in.