How To Fix OO637 - You cannot redefine the constructor

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 637

• Message text: You cannot redefine the constructor

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OO637 - You cannot redefine the constructor ?

  The SAP error message OO637, "You cannot redefine the constructor," typically occurs in ABAP Object-Oriented programming when there is an attempt to redefine a constructor method in a subclass that is not allowed due to the visibility or the nature of the constructor in the superclass.
  Cause:
  
  Constructor Visibility: The constructor in the superclass is declared as FINAL, which means it cannot be overridden in subclasses.
  Static Constructor: If the constructor is defined as static in the superclass, it cannot be redefined in the subclass.
  Incorrect Inheritance: The subclass may not be correctly inheriting from the superclass, or there may be a mismatch in the method signatures.
  
  Solution:
  
  Check Constructor Declaration: Review the constructor in the superclass. If it is declared as FINAL, you cannot redefine it in the subclass. You may need to create a new method in the subclass instead.
  Use Alternative Methods: If you need to perform additional initialization in the subclass, consider using a different method that can be called after the constructor of the superclass has been executed.
  Correct Inheritance: Ensure that the subclass is correctly inheriting from the superclass and that the method signatures match if you are trying to override a non-final constructor.
  Refactor Code: If necessary, refactor your code to avoid the need to redefine the constructor. This may involve changing the design of your classes.
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for Object-Oriented programming in ABAP for more details on constructors and inheritance.
  SAP Community: Check forums and community discussions for similar issues and solutions shared by other developers.
  Debugging: Use the ABAP debugger to step through the code and identify where the error is being triggered, which can provide additional context for resolving the issue.
  
  By following these steps, you should be able to resolve the OO637 error and ensure that your ABAP classes are correctly defined and functioning as intended.