Informix Error -4128

-4128 Handler should be a member of either the same class, or else

a base class, of the object.

The indicated handler is declared in the program but is not a member of same class as the object or of a base class from which the object is derived.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-4128 fires when a handler used in a HANDLE statement isn't a member of the same class as the target object, or of a base class it derives from — per the official guidance, the handler must belong to that class or one of its ancestors.

The handler is declared as a member of an unrelated class, per the official guidance — the direct, only cause.

Solutions / Resolution

Declare the handler as a member of the object's own class, or one of its base classes.

Examples

A handler from an unrelated class

CLASS Order
  ...
END CLASS

CLASS UnrelatedClass
  HANDLER myHandler
    ...
  END HANDLER
END CLASS

DEFINE o Order
HANDLE MyEvent WITH myHandler
-- -4128: myHandler belongs to UnrelatedClass, not Order or one of its bases

Corrected

CLASS Order
  HANDLER myHandler
    ...
  END HANDLER
END CLASS

Diagnostic Checks

Check which class the handler is declared in, and confirm it's the target object's own class or a base class of it.

Related Errors / Related Topics

-4126 — "Handler expected." A related handler-declaration error, about the WITH identifier not being a handler at all, rather than a valid handler in the wrong class.

The handler belongs to a class unrelated to the target object — move it to the object's own class or one of its base classes.