How To Fix SAI_MAPPING229 - Class &1 does not have a public default constructor

SAP Error Message - Details

• Message type: E = Error

• Message class: SAI_MAPPING - Mapping

• Message number: 229

• Message text: Class &1 does not have a public default constructor

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAI_MAPPING229 - Class &1 does not have a public default constructor ?

  The SAP error message SAI_MAPPING229 indicates that a class specified in your mapping does not have a public default constructor. This is a common issue when working with ABAP classes in SAP, particularly when using them in contexts that require instantiation without parameters.
  Cause:
  
  Missing Default Constructor: The class specified in the mapping does not have a public constructor that takes no parameters. In ABAP, if a class does not explicitly define a constructor, a default constructor is automatically provided. However, if a constructor is defined with parameters and no default constructor is defined, this error will occur.
  Access Modifiers: The constructor may be defined but is not public, which means it cannot be accessed from outside the class.
  Incorrect Class Reference: The class name specified in the mapping might be incorrect or not properly defined in the system.
  
  Solution:
  
  
  Add a Public Default Constructor: If the class does not have a default constructor, you need to add one. Here’s an example of how to define a public default constructor in an ABAP class:
  CLASS my_class DEFINITION.
    PUBLIC SECTION.
      METHODS: constructor.
  ENDCLASS.
  
  CLASS my_class IMPLEMENTATION.
    METHOD constructor.
      " Initialization code here
    ENDMETHOD.
  ENDCLASS.
  If you want to create a default constructor that does nothing, you can simply define it like this:
  CLASS my_class DEFINITION.
    PUBLIC SECTION.
      METHODS: constructor.
  ENDCLASS.
  
  CLASS my_class IMPLEMENTATION.
    METHOD constructor.
      " Default constructor
    ENDMETHOD.
  ENDCLASS.
  
  
  Check Access Modifiers: Ensure that the constructor is declared in the PUBLIC SECTION of the class definition.
  
  
  Verify Class Name: Double-check the class name used in the mapping to ensure it is correct and that the class is properly activated in the system.
  
  
  Review Mapping Configuration: If you are using this class in a mapping context (like in a data transformation or service), ensure that the mapping configuration is correctly set up to reference the class.
  
  
  Related Information:
  
  ABAP Class Documentation: Review the official SAP documentation on ABAP classes and constructors for more details on how to define and use them.
  Debugging: If you continue to face issues, consider using the ABAP debugger to trace where the error occurs and inspect the class instantiation process.
  SAP Community: Engage with the SAP Community forums for additional insights and solutions from other developers who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the SAI_MAPPING229 error and ensure that your class can be instantiated correctly in the required context.