Why is an API gateway pattern recommended when deploying transformed Java modules that replace extracted COBOL services?
Select an answer to reveal the explanation.
Short Explanation
An API gateway gives you one stable front door for requests, so COBOL callers can reach the new Java service without knowing its internals. On real mainframe exams, this concept comes up repeatedly, so make sure you have it locked in.
Full Explanation
An API gateway gives a single stable entry point routing requests from COBOL callers to the new Java implementation, decoupling callers from Java internals. It does not automatically generate DB2 schemas from the Java data model produced by wca4z, run IBM watsonx Code Assistant for Z as a sidecar, or convert Java calls back to COBOL CALL statements.