How To Fix J2436 - Start class conversion - reversal

SAP Error Message - Details

• Message type: E = Error

• Message class: J2 - Message Class for Development Class JBT

• Message number: 436

• Message text: Start class conversion - reversal

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message J2436 - Start class conversion - reversal ?

  The SAP error message J2436, "Start class conversion - reversal," typically occurs in the context of class-based object-oriented programming in ABAP (Advanced Business Application Programming). This error indicates that there is an issue with the conversion of an object from one class to another, particularly when dealing with inheritance or polymorphism.
  Cause:
  
  Incorrect Class Hierarchy: The object you are trying to convert may not be compatible with the target class. This can happen if the object is not an instance of the expected class or its subclasses.
  Invalid Type Casting: Attempting to cast an object to a class that it does not inherit from can lead to this error.
  Object Lifecycle Issues: The object may not be properly instantiated or may have been destroyed before the conversion attempt.
  Data Type Mismatch: There may be a mismatch in the expected data types during the conversion process.
  
  Solution:
  
  
  Check Class Hierarchy: Ensure that the object you are trying to convert is indeed an instance of the class or its subclass. You can use the IS INSTANCE OF operator to verify the type of the object before performing the conversion.
  IF my_object IS INSTANCE OF my_target_class.
      " Safe to convert
      my_target_object = my_object.
  ELSE.
      " Handle the error
  ENDIF.
  
  
  Review Object Instantiation: Make sure that the object is properly instantiated before the conversion. Check the constructor and ensure that it is being called correctly.
  
  
  Debugging: Use the ABAP debugger to step through the code and identify where the conversion is failing. Look for the specific line of code that triggers the error and examine the state of the objects involved.
  
  
  Error Handling: Implement error handling to manage situations where the conversion might fail. This can include logging the error or providing a fallback mechanism.
  
  
  Consult Documentation: Review the SAP documentation for the specific classes and methods you are using to ensure that you are following the correct usage patterns.
  
  
  Related Information:
  
  ABAP Object-Oriented Programming: Familiarize yourself with the principles of object-oriented programming in ABAP, including inheritance, polymorphism, and class interfaces.
  SAP Notes: Check SAP Notes and Knowledge Base Articles (KBAs) for any known issues or patches related to this error message.
  Community Forums: Engage with the SAP community through forums like SAP Community or Stack Overflow to see if others have encountered and resolved similar issues.
  
  By following these steps, you should be able to diagnose and resolve the J2436 error in your SAP environment.